Does anyone have this problem: periodically hashrate drops by 50-60% and doesn't recover until reboot.
Rig with 13 Nvidia 1060 cards under Ubuntu running Claymore 10.6. It can run days without problems at steady 315Mh/s, but always ends the same way: hashrate drops to 120-140Mh/s, web api not responsive and I can't access machine via Teamviewer - need to go and reboot it.
Here's screenshot from Ethermine and part of log file when this happens:
https://imgur.com/a/yit6Y23:11:15:766 dd7da700 ETH:
02/12/18-23:11:15 - New job from eu1.ethermine.org:4444
23:11:15:766 dd7da700 target: 0x0000000112e0be82 (diff: 4000MH), epoch 169(2.32GB)
23:11:15:766 dd7da700
ETH - Total Speed: 315.275 Mh/s, Total Shares: 35089, Rejected: 3, Time: 124:37
23:11:15:766 dd7da700 ETH: GPU0 24.322 Mh/s, GPU1 24.316 Mh/s, GPU2 24.236 Mh/s, GPU3 24.128 Mh/s, GPU4 24.128 Mh/s, GPU5 24.336 Mh/s, GPU6 24.151 Mh/s, GPU7 24.355 Mh/s, GPU8 24.339 Mh/s, GPU9 24.310 Mh/s, GPU10 24.321 Mh/s, GPU11 24.014 Mh/s, GPU12 24.317 Mh/s
23:11:16:982 438e8700 GPU0 t=50C fan=70%, GPU1 t=47C fan=70%, GPU2 t=50C fan=70%, GPU3 t=38C fan=70%, GPU4 t=43C fan=70%, GPU5 t=44C fan=70%, GPU6 t=40C fan=70%, GPU7 t=46C fan=70%, GPU8 t=44C fan=70%, GPU9 t=50C fan=70%, GPU10 t=50C fan=70%, GPU11 t=45C fan=70%, GPU12 t=42C fan=70%
23:11:17:697 df7de700 ETH: put share nonce 12bf1880013a3741
23:11:17:697 df7de700 ETH round found 1 shares
23:11:17:697 dd7da700 ETH: 02/12/18-23:11:17 - SHARE FOUND - (GPU 11)
23:11:17:697 dd7da700 send: {"id":21,"method":"eth_submitWork","params":["0x12bf1880013a3741","0x50681fc6f6cbdcd5b25cd3ef7af1153e8980f0be56f13953f32b83ba14672772","0xe3ba255be5e7c1a7abef03553d4f632041b37ef2660fcde8a56854c6b294a2ca"]}
23:11:17:732 dd7da700 got 40 bytes
23:11:17:732 dd7da700 buf: {"id":21,"jsonrpc":"2.0","result":true}
23:11:17:732 dd7da700 parse packet: 39
23:11:17:733 dd7da700 ETH: Share accepted (35 ms)!
23:11:17:733 dd7da700 new buf size: 0
23:11:20:007 dd7da700 ETH: checking pool connection...
23:11:20:007 dd7da700 send: {"worker": "", "jsonrpc": "2.0", "params": [], "id": 3, "method": "eth_getWork"}
23:11:20:037 dd7da700 got 248 bytes
23:11:20:037 dd7da700 buf: {"id":3,"jsonrpc":"2.0","result":["0x50681fc6f6cbdcd5b25cd3ef7af1153e8980f0be56f13953f32b83ba14672772","0xf4c702c8373b1a6467eb30d4640b62436e55a6c8c9e2f486197f6e0b2dd72f5f","0x0112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0x4d7fe6"]}
23:11:20:037 dd7da700 parse packet: 247
23:11:20:037 dd7da700 ETH: job is the same
23:11:20:037 dd7da700 new buf size: 0
23:11:27:925 dd7da700 got 248 bytes
23:11:27:925 dd7da700 buf: {"id":0,"jsonrpc":"2.0","result":["0x6050064dd575c945de1c14326511f907abe9597f9345b125efeb95f1dd8f49b8","0xf4c702c8373b1a6467eb30d4640b62436e55a6c8c9e2f486197f6e0b2dd72f5f","0x0112e0be826d694b2e62d01511f12a6061fbaec8bc02357593e70e52ba","0x4d7fe7"]}
23:11:27:925 dd7da700 parse packet: 247
23:11:27:925 dd7da700 ETH: job changed
23:11:27:925 dd7da700 new buf size: 0
23:11:27:925 dd7da700 ETH:
02/12/18-23:11:27 - New job from eu1.ethermine.org:4444
23:11:27:925 dd7da700 target: 0x0000000112e0be82 (diff: 4000MH), epoch 169(2.32GB)
23:11:27:925 dd7da700 ETH -
Total Speed: 123.539 Mh/s, Total Shares: 35090, Rejected: 3, Time: 124:37
23:11:27:925 dd7da700 ETH: GPU0 14.455 Mh/s, GPU1 8.728 Mh/s, GPU2 8.727 Mh/s, GPU3 8.729 Mh/s, GPU4 8.727 Mh/s, GPU5 8.727 Mh/s, GPU6 8.727 Mh/s, GPU7 8.727 Mh/s, GPU8 8.727 Mh/s, GPU9 8.727 Mh/s, GPU10 13.086 Mh/s, GPU11 8.729 Mh/s, GPU12 8.726 Mh/s