I haven't kept up with this thread for a while so please bear with me if this has been commented on earlier..
Today one of my rigs started to misbehave where it kept reinitializing itself loading DAG for epoch 128...
Notice the increase in reported hashrate, too
I am using version 9.7 btw
See log excerpt below.
15:39:35:078 478 ETH: 08/22/17-15:39:35 - New job from eu1.ethermine.org:4444
15:39:35:078 478 target: 0x0000000112e0be82 (diff: 4000MH), epoch 128(2.00GB)
15:39:35:078 478 ETH - Total Speed: 105.144 Mh/s, Total Shares: 3652, Rejected: 17, Time: 40:32
15:39:35:078 478 ETH: GPU0 27.043 Mh/s, GPU1 25.258 Mh/s, GPU2 27.031 Mh/s, GPU3 25.812 Mh/s
15:39:35:110 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26
15:39:35:110 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:35:125 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:35:125 af8 GPU 3 temp = 57, old fan speed = 36, new fan speed = 26
15:39:35:250 87c Setting DAG epoch #128...
15:39:36:888 87c Setting DAG epoch #128 for GPU2
15:39:36:888 6dc Setting DAG epoch #128 for GPU0
15:39:36:888 2e4 Setting DAG epoch #128 for GPU1
15:39:36:888 12c Setting DAG epoch #128 for GPU3
15:39:38:432 af8 GPU 0 temp = 49, old fan speed = 35, new fan speed = 26
15:39:38:432 af8 GPU 1 temp = 55, old fan speed = 36, new fan speed = 26
15:39:38:432 af8 GPU 2 temp = 48, old fan speed = 35, new fan speed = 26
15:39:38:432 af8 GPU 3 temp = 55, old fan speed = 36, new fan speed = 26
15:39:40:897 87c GPU2 DAG creation time - 3898 ms
15:39:40:897 87c Setting DAG epoch #128 for GPU2 done
15:39:40:913 12c GPU3 DAG creation time - 3893 ms
15:39:40:913 12c Setting DAG epoch #128 for GPU3 done
15:39:40:944 6dc GPU0 DAG creation time - 3899 ms
15:39:40:944 6dc Setting DAG epoch #128 for GPU0 done
15:39:40:991 2e4 GPU1 DAG creation time - 3981 ms
15:39:40:991 2e4 Setting DAG epoch #128 for GPU1 done
15:39:41:740 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26
15:39:41:740 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:41:740 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:41:755 af8 GPU 3 temp = 56, old fan speed = 36, new fan speed = 26
15:39:45:062 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26
15:39:45:062 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:45:062 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:45:062 af8 GPU 3 temp = 57, old fan speed = 35, new fan speed = 26
15:39:46:654 478 send: {"id":6,"jsonrpc":"2.0","method":"eth_submitHashrate","params":["0x6d297c5", "0x0000000000000000000000000000000000000000000000000000000022a6a6be"]}
15:39:46:700 478 got 39 bytes
15:39:46:700 478 buf: {"id":6,"jsonrpc":"2.0","result":true}
15:39:46:700 478 parse packet: 38
15:39:46:700 478 new buf size: 0
15:39:48:370 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26
15:39:48:370 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:48:370 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:48:385 af8 GPU 3 temp = 57, old fan speed = 35, new fan speed = 26
15:39:48:666 478 got 248 bytes
15:39:48:666 478 buf: {"id":0,"jsonrpc":"2.0","result":["0xda266190a0e595bd3484b6e6025de12aeb0ececf7c7d686b873a1f78b5b362e1","0x7c4fb8a5d141973b69b521ce76b0dc50f0d2834d817c7f8310a6ab5becc6bb0c","0x0112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0x3acbdb"]}
15:39:48:666 478 parse packet: 247
15:39:48:666 478 ETH: job changed
15:39:48:666 478 new buf size: 0
15:39:48:666 478 ETH: 08/22/17-15:39:48 - New job from eu1.ethermine.org:4444
15:39:48:666 478 target: 0x0000000112e0be82 (diff: 4000MH), epoch 128(2.00GB)
15:39:48:666 478 ETH - Total Speed: 114.458 Mh/s, Total Shares: 3652, Rejected: 17, Time: 40:32
15:39:48:666 478 ETH: GPU0 29.530 Mh/s, GPU1 27.405 Mh/s, GPU2 29.557 Mh/s, GPU3 27.967 Mh/s
15:39:50:741 478 ETH: checking pool connection...
15:39:50:741 478 send: {"id":3,"jsonrpc":"2.0","method":"eth_getWork","params":[]}
15:39:50:788 478 got 248 bytes
15:39:50:788 478 buf: {"id":3,"jsonrpc":"2.0","result":["0xda266190a0e595bd3484b6e6025de12aeb0ececf7c7d686b873a1f78b5b362e1","0x7c4fb8a5d141973b69b521ce76b0dc50f0d2834d817c7f8310a6ab5becc6bb0c","0x0112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0x3acbdb"]}
15:39:50:788 478 parse packet: 247
15:39:50:788 478 ETH: job is the same
15:39:50:788 478 new buf size: 0
15:39:51:693 af8 GPU 0 temp = 51, old fan speed = 35, new fan speed = 26
15:39:51:693 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:51:693 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:51:693 af8 GPU 3 temp = 57, old fan speed = 35, new fan speed = 26
15:39:54:937 478 got 248 bytes
15:39:54:937 478 buf: {"id":0,"jsonrpc":"2.0","result":["0xb3a8247f1c8c554d9d329e4a13b68fd6f8fddd7d408511f09fbff14265eb7e94","0xc50f0eb9498c019d38f28db0aefec38f0a243f1bcbc67281ce622916ee182e4a","0x0112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0x3ff027"]}
15:39:54:937 478 parse packet: 247
15:39:54:937 478 ETH: job changed
15:39:54:937 478 new buf size: 0
15:39:54:937 478 ETH: 08/22/17-15:39:54 - New job from eu1.ethermine.org:4444
15:39:54:937 478 target: 0x0000000112e0be82 (diff: 4000MH), epoch 139(2.09GB)
15:39:54:937 478 ETH - Total Speed: 114.380 Mh/s, Total Shares: 3652, Rejected: 17, Time: 40:32
15:39:54:937 478 ETH: GPU0 29.480 Mh/s, GPU1 27.402 Mh/s, GPU2 29.536 Mh/s, GPU3 27.962 Mh/s
15:39:55:000 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26
15:39:55:000 af8 GPU 1 temp = 56, old fan speed = 36, new fan speed = 26
15:39:55:000 af8 GPU 2 temp = 50, old fan speed = 35, new fan speed = 26
15:39:55:015 af8 GPU 3 temp = 57, old fan speed = 36, new fan speed = 26
15:39:55:031 af8 GPU0 t=50C fan=35%, GPU1 t=56C fan=36%, GPU2 t=50C fan=35%, GPU3 t=57C fan=36%
15:39:55:031 af8 em hbt: 0, fm hbt: 16,
15:39:55:031 af8 watchdog - thread 0 (gpu0), hb time 234
15:39:55:031 af8 watchdog - thread 1 (gpu0), hb time 94
15:39:55:031 af8 watchdog - thread 2 (gpu1), hb time 62
15:39:55:031 af8 watchdog - thread 3 (gpu1), hb time 218
15:39:55:031 af8 watchdog - thread 4 (gpu2), hb time 156
15:39:55:031 af8 watchdog - thread 5 (gpu2), hb time 0
15:39:55:031 af8 watchdog - thread 6 (gpu3), hb time 265
15:39:55:031 af8 watchdog - thread 7 (gpu3), hb time 125
15:39:55:078 6dc Setting DAG epoch #139...
15:39:56:794 6dc Setting DAG epoch #139 for GPU0
15:39:56:794 474 Setting DAG epoch #139 for GPU2
15:39:56:809 3c4 Setting DAG epoch #139 for GPU1
15:39:56:809 12c Setting DAG epoch #139 for GPU3
15:39:58:323 af8 GPU 0 temp = 49, old fan speed = 35, new fan speed = 26
15:39:58:338 af8 GPU 1 temp = 55, old fan speed = 36, new fan speed = 26
15:39:58:338 af8 GPU 2 temp = 49, old fan speed = 35, new fan speed = 26
15:39:58:354 af8 GPU 3 temp = 55, old fan speed = 36, new fan speed = 26
15:40:01:006 474 GPU2 DAG creation time - 4081 ms
15:40:01:006 474 Setting DAG epoch #139 for GPU2 done
15:40:01:006 12c GPU3 DAG creation time - 4077 ms
15:40:01:006 12c Setting DAG epoch #139 for GPU3 done
15:40:01:037 6dc GPU0 DAG creation time - 4082 ms
15:40:01:037 6dc Setting DAG epoch #139 for GPU0 done
15:40:01:099 3c4 GPU1 DAG creation time - 4168 ms
15:40:01:099 3c4 Setting DAG epoch #139 for GPU1 done
15:40:01:661 af8 GPU 0 temp = 50, old fan speed = 35, new fan speed = 26