Hello, Claymore!
I am not an Englishman, so I apologize for the language in advance.

Regularly one card in rig starts to continuously get incorrect shares. It can work 3-5-10 days 24/7 with no problem, and suddenly all the shares are incorrect: "GPU #2 got incorrect share. If you see this warning often, make sure you did not overclock it too much!"
Overclocked or not does not matter, the same result. After rebooting begins to work well next period.

Would be very good if the miner will be have watchdog option: if 9 of 10 last shares from one card are incorrect, then execute reboot.bat.


(Rig configuration: 2x Sapphire Nitro R9 390, 2x Gigabyte R9 290 3X, 1x Sapphire R9 290 3X, MB GIGABYTE GA-X38-DS4, Win 10, Crimson 15.12, Claymore's miner 5.1 beta, Eth only) (GPU #2 - Gigabyte R9 290 3X 1040/1250)