I have strange problem that requires several reboots to resolve. My rig works fine good for days. But my location sometimes has issues with power outages. I start my rig after power recovers, however one of the gpus hashing less than usual rate (26.3 or 13 instead of 29.3 modded rate).To fix this, I need to reboot my rig several times. At first try I lose one or two gpus. I reseat their risers and problem resolved.

Then I start my rig and this time, everything is great. Problem repeats every time whenever a power outage occurs.

Any suggestions?