Continuing the discussion from ["Your Rendering Device Has Been Lost"]
If you have a card with two 6/8-pin power connectors, connect them to two 12V rails from the PSU instead of just one. If your GPU consumes 150W or more at full load, it’s best to use both rails anyway.
This worked for me and I hope this will help fix the issue for others. I was able to resolve this issue on two machines with this method. Sorry, but I haven’t tried on an AMD card.
MSI Armor GTX 1080 w/ Seasonic M12 620W
EVGA GTX 460 w/ cheapo Ultra 550W