I'm getting the following error on one of my rigs:

ERROR:  Looks like GPU4 are stuck
WARNING:  Looks like GPU4 are stopped. Restarting...

I'm running ewbf-v0.5-cuda9.1 on SMOS mining equihash-BTG

Motherboard is an asrock h110 pro btc+ running 13x 1060 6gb gpu's

I've reduced OC on GPU4 but still getting the error anywhere from 1-2 hours after a restart to 1 day.  Rest of the gpu's are mining fine.

Any ideas how to fix the error?