there is something wrong with the driver on these.. its been stated before and it has not been addressed or mentioned as a bug..
if you mine with these, and put another pool as a failover.. if that failover pool gets a new block before your main pool does, the whole thing stops mining and times out..
so a little bit of a log to show what happens..
Stratum from pool 1 detected new block
Rejected 005e272e MLD 0 pool 0 Diff 10m/7m (job not found)
after this mining stops completly until you restart the miner.
here is the whole log. as you can see it was mining just fine, then it stops when pool 1 finds a block
this means you cant set a failover pool..
[2018-04-05 10:54:07] Started bfgminer 5.2.0-188-g10220342
[2018-04-05 10:54:07] Loaded configuration file /var/www/minera/conf/miner_conf.json
[2018-04-05 10:54:12] Probing for an alive pool
[2018-04-05 10:54:12] Testing pool stratum+tcp://tbdice.org:13333
[2018-04-05 10:54:12] Testing pool stratum+tcp://hub.miningpoolhub.com:17001#skipcbcheck
[2018-04-05 10:54:12] Testing pool stratum+tcp://ispace.co.uk:9301#skipcbcheck
[2018-04-05 10:54:18] Stratum authorisation success for pool 1
[2018-04-05 10:54:18] Switching to pool 1 stratum+tcp://hub.miningpoolhub.com:17001#skipcbcheck - first alive pool
[2018-04-05 10:54:18] Network difficulty changed to 55.8k (399.6G)
[2018-04-05 10:54:18] New block: ...04eba325f6c21f5a diff 55.8k (399.6G)
[2018-04-05 10:54:18] Stratum from pool 1 detected new block
[2018-04-05 10:54:18] API running in IP access mode on port 4028
[2018-04-05 10:54:19] New best share: 12m
[2018-04-05 10:54:19] Message from pool 2: Authorised, welcome to LTC TBDice TestNET MultiSIG=No LTC ADDRESS!
[2018-04-05 10:54:19] Stratum authorisation success for pool 2
[2018-04-05 10:54:19] Pool 2 stratum+tcp://tbdice.org:13333 alive
[2018-04-05 10:54:19] Network difficulty changed to 6.8M (48.70T)
[2018-04-05 10:54:19] New block: ...e2afcdc908eb57eb diff 6.8M (48.70T)
[2018-04-05 10:54:19] Stratum from pool 2 detected new block
[2018-04-05 10:54:19] Closing socket for stratum pool 2
[2018-04-05 10:54:19] Stratum authorisation success for pool 0
[2018-04-05 10:54:19] Pool 0 stratum+tcp://ispace.co.uk:9301#skipcbcheck alive
[2018-04-05 10:54:19] Switching to pool 0 stratum+tcp://ispace.co.uk:9301#skipcbcheck
[2018-04-05 10:54:19] Network difficulty changed to 14.1k (100.8G)
[2018-04-05 10:54:19] New block: ...8415736d5ffebe0b diff 14.1k (100.8G)
[2018-04-05 10:54:19] JSON-RPC non method decode failed: (null)
[2018-04-05 10:54:19] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:54:20] New best share: 67m
[2018-04-05 10:54:20] Accepted 000edb87 MLD 7 pool 0 Diff 67m/7m
[2018-04-05 10:54:22] Accepted 00177c7f MLD 1 pool 0 Diff 42m/7m
[2018-04-05 10:54:23] Accepted 0042f8f5 MLD 1 pool 0 Diff 14m/7m
[2018-04-05 10:54:25] Accepted 006942fc MLD 5 pool 0 Diff 9m/7m
[2018-04-05 10:54:25] Accepted 00321a5b MLD 3 pool 0 Diff 19m/7m
[2018-04-05 10:54:26] Network difficulty changed to 25.3k (180.9G)
[2018-04-05 10:54:26] New block: ...c50219500c0505a7 diff 25.3k (180.9G)
[2018-04-05 10:54:26] Stratum from pool 0 detected new block
[2018-04-05 10:54:26] JSON-RPC non method decode failed: (null)
[2018-04-05 10:54:26] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:54:26] Accepted 002c4149 MLD 3 pool 0 Diff 22m/7m
[2018-04-05 10:54:27] New best share: 119m
[2018-04-05 10:54:27] Accepted 00538b9b MLD 3 pool 0 Diff 11m/7m
[2018-04-05 10:54:27] Accepted 0026f35a MLD 1 pool 0 Diff 25m/7m
[2018-04-05 10:54:27] Accepted 00085e28 MLD 1 pool 0 Diff 119m/7m
[2018-04-05 10:54:27] Accepted 006999bb MLD 1 pool 0 Diff 9m/7m
[2018-04-05 10:54:27] Accepted 000936de MLD 6 pool 0 Diff 108m/7m
[2018-04-05 10:54:30] Accepted 00185ed5 MLD 6 pool 0 Diff 41m/7m
[2018-04-05 10:54:32] New best share: 194m
[2018-04-05 10:54:32] Accepted 000523ef MLD 4 pool 0 Diff 194m/7m
[2018-04-05 10:54:32] Accepted 006807d7 MLD 4 pool 0 Diff 9m/7m
[2018-04-05 10:54:32] New best share: 18
[2018-04-05 10:54:32] Accepted 00000e14 MLD 7 pool 0 Diff 18/7m
[2018-04-05 10:54:33] Accepted 0075acac MLD 7 pool 0 Diff 8m/7m
[2018-04-05 10:54:34] Accepted 0017389e MLD 7 pool 0 Diff 43m/7m
[2018-04-05 10:54:35] Accepted 00317e12 MLD 4 pool 0 Diff 20m/7m
[2018-04-05 10:54:37] Accepted 004eea0d MLD 5 pool 0 Diff 12m/7m
[2018-04-05 10:54:38] Accepted 0018737b MLD 1 pool 0 Diff 40m/7m
[2018-04-05 10:54:38] Accepted 006f1d3d MLD 1 pool 0 Diff 8m/7m
[2018-04-05 10:54:39] 20s:14.79 avg:38.08 u:36.02 Mh/s | A:21 R:0+0(none) HW:16/4.4%
[2018-04-05 10:54:43] Accepted 002d614a MLD 6 pool 0 Diff 22m/7m
[2018-04-05 10:54:43] Pool 0 is hiding block contents from us
[2018-04-05 10:54:43] Accepted 000b77a6 MLD 1 pool 0 Diff 87m/7m
[2018-04-05 10:54:43] Accepted 005929f7 MLD 1 pool 0 Diff 11m/7m
[2018-04-05 10:54:44] Accepted 00399aa3 MLD 7 pool 0 Diff 17m/7m
[2018-04-05 10:54:45] Accepted 00679d9e MLD 4 pool 0 Diff 9m/7m
[2018-04-05 10:54:46] Accepted 004d3c13 MLD 5 pool 0 Diff 12m/7m
[2018-04-05 10:54:47] Accepted 007230d8 MLD 0 pool 0 Diff 8m/7m
[2018-04-05 10:54:49] Accepted 00190dc3 MLD 1 pool 0 Diff 39m/7m
[2018-04-05 10:54:51] Accepted 00388b55 MLD 1 pool 0 Diff 17m/7m
[2018-04-05 10:54:52] Accepted 004027ff MLD 4 pool 0 Diff 15m/7m
[2018-04-05 10:54:53] Accepted 000a80d6 MLD 0 pool 0 Diff 95m/7m
[2018-04-05 10:54:54] Accepted 003b798e MLD 5 pool 0 Diff 16m/7m
[2018-04-05 10:54:54] Accepted 006139e9 MLD 7 pool 0 Diff 10m/7m
[2018-04-05 10:54:56] Accepted 002e710f MLD 1 pool 0 Diff 21m/7m
[2018-04-05 10:54:56] Accepted 001f9db6 MLD 3 pool 0 Diff 31m/7m
[2018-04-05 10:54:56] Accepted 00616e64 MLD 0 pool 0 Diff 10m/7m
[2018-04-05 10:54:57] Accepted 004bf915 MLD 0 pool 0 Diff 13m/7m
[2018-04-05 10:54:57] Accepted 00053c0f MLD 3 pool 0 Diff 191m/7m
[2018-04-05 10:54:57] Accepted 000dadb3 MLD 3 pool 0 Diff 73m/7m
[2018-04-05 10:54:57] Accepted 003de119 MLD 4 pool 0 Diff 16m/7m
[2018-04-05 10:54:57] Accepted 002f0432 MLD 6 pool 0 Diff 21m/7m
[2018-04-05 10:54:58] Accepted 006e3c15 MLD 3 pool 0 Diff 9m/7m
[2018-04-05 10:54:59] 20s:23.99 avg:38.26 u:36.13 Mh/s | A:43 R:0+0(none) HW:19/2.7%
[2018-04-05 10:55:01] Accepted 00126947 MLD 3 pool 0 Diff 54m/7m
[2018-04-05 10:55:03] Accepted 007af57f MLD 4 pool 0 Diff 8m/7m
[2018-04-05 10:55:03] Accepted 0032f2f6 MLD 4 pool 0 Diff 19m/7m
[2018-04-05 10:55:04] Accepted 00239aaa MLD 4 pool 0 Diff 28m/7m
[2018-04-05 10:55:04] Accepted 0053ee46 MLD 0 pool 0 Diff 11m/7m
[2018-04-05 10:55:04] Accepted 005aa348 MLD 6 pool 0 Diff 11m/7m
[2018-04-05 10:55:04] Accepted 000f1d38 MLD 4 pool 0 Diff 66m/7m
[2018-04-05 10:55:06] Accepted 003829ae MLD 0 pool 0 Diff 17m/7m
[2018-04-05 10:55:07] Accepted 002d03b4 MLD 5 pool 0 Diff 22m/7m
[2018-04-05 10:55:07] Accepted 00151ed5 MLD 4 pool 0 Diff 47m/7m
[2018-04-05 10:55:08] Accepted 006d110c MLD 0 pool 0 Diff 9m/7m
[2018-04-05 10:55:08] Accepted 003ec4d5 MLD 6 pool 0 Diff 15m/7m
[2018-04-05 10:55:09] Accepted 002b5734 MLD 4 pool 0 Diff 23m/7m
[2018-04-05 10:55:10] Accepted 0020b936 MLD 2 pool 0 Diff 30m/7m
[2018-04-05 10:55:11] Accepted 00578ebd MLD 3 pool 0 Diff 11m/7m
[2018-04-05 10:55:11] Accepted 002f8b96 MLD 4 pool 0 Diff 21m/7m
[2018-04-05 10:55:12] Accepted 0008d2f6 MLD 4 pool 0 Diff 113m/7m
[2018-04-05 10:55:12] Accepted 0056e374 MLD 5 pool 0 Diff 11m/7m
[2018-04-05 10:55:13] Accepted 0075e457 MLD 0 pool 0 Diff 8m/7m
[2018-04-05 10:55:14] Accepted 005f96f9 MLD 3 pool 0 Diff 10m/7m
[2018-04-05 10:55:14] Accepted 00379b3a MLD 3 pool 0 Diff 17m/7m
[2018-04-05 10:55:15] Pool 0 stale share detected, submitting as user requested
[2018-04-05 10:55:15] Network difficulty changed to 54.4k (389.6G)
[2018-04-05 10:55:15] New block: ...139fcedfa996ae26 diff 54.4k (389.6G)
[2018-04-05 10:55:15] Stratum from pool 1 detected new block
[2018-04-05 10:55:15] JSON-RPC non method decode failed: (null)
[2018-04-05 10:55:15] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:55:15] Rejected 005e272e MLD 0 pool 0 Diff 10m/7m (job not found)
[2018-04-05 10:55:19] 20s:26.49 avg:35.61 u:33.28 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:55:40] 20s:16.18 avg:26.71 u:24.96 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:56:00] 20s: 9.88 avg:21.37 u:19.98 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:56:10] JSON-RPC non method decode failed: (null)
[2018-04-05 10:56:10] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:56:11] JSON-RPC non method decode failed: (null)
[2018-04-05 10:56:11] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:56:20] 20s: 6.03 avg:17.81 u:16.65 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:56:41] 20s: 3.68 avg:15.26 u:14.26 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:57:01] 20s: 2.25 avg:13.35 u:12.48 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:57:05] Closing socket for stratum pool 1
[2018-04-05 10:57:06] JSON-RPC non method decode failed: (null)
[2018-04-05 10:57:06] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:57:21] 20s: 1.37 avg:11.87 u:11.09 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:57:42] 20s: 0.84 avg:10.68 u: 9.99 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:58:01] JSON-RPC non method decode failed: (null)
[2018-04-05 10:58:01] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:58:02] 20s: 0.51 avg: 9.72 u: 9.08 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:58:22] 20s: 0.31 avg: 8.91 u: 8.33 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:58:33] JSON-RPC non method decode failed: (null)
[2018-04-05 10:58:33] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:58:42] 20s: 0.19 avg: 8.23 u: 7.69 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:59:02] 20s: 0.12 avg: 7.64 u: 7.14 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:59:23] 20s: 0.07 avg: 7.13 u: 6.67 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 10:59:28] JSON-RPC non method decode failed: (null)
[2018-04-05 10:59:28] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:59:36] JSON-RPC non method decode failed: (null)
[2018-04-05 10:59:36] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:59:36] JSON-RPC non method decode failed: (null)
[2018-04-05 10:59:36] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 10:59:43] 20s: 0.04 avg: 6.69 u: 6.25 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 11:00:03] 20s: 0.03 avg: 6.30 u: 5.89 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 11:00:04] JSON-RPC non method decode failed: (null)
[2018-04-05 11:00:04] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 11:00:15] JSON-RPC non method decode failed: (null)
[2018-04-05 11:00:15] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 11:00:23] 20s: 0.02 avg: 5.95 u: 5.56 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 11:00:43] 20s: 0.01 avg: 5.64 u: 5.27 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 11:01:04] 20s: 0.01 avg: 5.35 u: 5.00 Mh/s | A:64 R:1+0(1.5%) HW:19/1.9%
[2018-04-05 11:01:10] JSON-RPC non method decode failed: (null)
[2018-04-05 11:01:10] Unknown stratum msg: {"id":null,"result":[],"error":true}
here is another after i restarted.. same thing
[2018-04-05 11:04:47] Started bfgminer 5.2.0-188-g10220342
[2018-04-05 11:04:47] Loaded configuration file /var/www/minera/conf/miner_conf.json
[2018-04-05 11:04:53] Probing for an alive pool
[2018-04-05 11:04:53] Testing pool stratum+tcp://hub.miningpoolhub.com:17001#skipcbcheck
[2018-04-05 11:04:53] Testing pool stratum+tcp://ispace.co.uk:9301#skipcbcheck
[2018-04-05 11:04:57] Stratum authorisation success for pool 1
[2018-04-05 11:04:57] Switching to pool 1 stratum+tcp://hub.miningpoolhub.com:17001#skipcbcheck - first alive pool
[2018-04-05 11:04:57] Network difficulty changed to 59.9k (429.1G)
[2018-04-05 11:04:57] New block: ...e30999fa08fc6fb8 diff 59.9k (429.1G)
[2018-04-05 11:04:57] Stratum from pool 1 detected new block
[2018-04-05 11:04:58] Stratum authorisation success for pool 0
[2018-04-05 11:04:58] Pool 0 stratum+tcp://ispace.co.uk:9301#skipcbcheck alive
[2018-04-05 11:04:58] Switching to pool 0 stratum+tcp://ispace.co.uk:9301#skipcbcheck
[2018-04-05 11:04:58] API running in IP access mode on port 4028
[2018-04-05 11:04:58] Network difficulty changed to 17.3k (124.2G)
[2018-04-05 11:04:58] New block: ...fa47e42e2f32010d diff 17.3k (124.2G)
[2018-04-05 11:04:58] JSON-RPC non method decode failed: (null)
[2018-04-05 11:04:58] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 11:04:59] New best share: 607µ
[2018-04-05 11:04:59] New best share: 665µ
[2018-04-05 11:04:59] New best share: 3m
[2018-04-05 11:04:59] New best share: 5m
[2018-04-05 11:04:59] New best share: 11m
[2018-04-05 11:04:59] Accepted 0053e3f9 MLD 0 pool 0 Diff 11m/7m
[2018-04-05 11:04:59] Accepted 006f8a40 MLD 4 pool 0 Diff 8m/7m
[2018-04-05 11:05:01] JSON-RPC non method decode failed: (null)
[2018-04-05 11:05:01] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 11:05:02] Accepted 0068284d MLD 4 pool 0 Diff 9m/7m
[2018-04-05 11:05:03] Network difficulty changed to 65.7k (470.5G)
[2018-04-05 11:05:03] New block: ...459e8b9f1da13300 diff 65.7k (470.5G)
[2018-04-05 11:05:03] Stratum from pool 1 detected new block
[2018-04-05 11:05:03] Closing socket for stratum pool 1
[2018-04-05 11:05:19] 20s: 2.89 avg: 7.39 u: 7.44 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:05:39] 20s: 1.77 avg: 3.72 u: 3.75 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:05:56] Pool 0 is hiding block contents from us
[2018-04-05 11:05:56] JSON-RPC non method decode failed: (null)
[2018-04-05 11:05:56] Unknown stratum msg: {"id":null,"result":[],"error":true}
[2018-04-05 11:05:59] 20s: 1.08 avg: 2.49 u: 2.51 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:06:19] 20s: 0.66 avg: 1.87 u: 1.88 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:06:39] 20s: 0.40 avg: 1.50 u: 1.51 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:07:00] 20s: 0.25 avg: 1.25 u: 1.26 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:07:20] 20s: 0.15 avg: 1.07 u: 1.08 Mh/s | A:3 R:0+0(none) HW:11/ 13%
[2018-04-05 11:07:40] 20s: 92.2 avg:938.6 u:944.9 kh/s | A:3 R:0+0(none) HW:11/ 13%