Upgraded to 11.0, and I don't know how or why, but something corrupted in ALL my mining rigs. They've been running fine for almost 2 years. All I do with them is log on in TeamViewer occasionally to see that GPU temps are good, and to install claymore updates when they come out. Well, I updated all my rigs to 11.0, checked TeamViewer couple days later. All offline. Hmm, that's weird. Maybe a circuit breaker was tripped, maybe my girlfriend unplugged them for some reason? Not too sure, so I go to investigate. Everything looks ok, but I try to boot them up, some of them hard freeze right away, others hard freeze after I try launching claymore miner. ALL RIGS! Not one. Not most. ALL. So I spent the last 14 hours reformatting, reinstalling, and reconfiguring my mining rigs, and installed 10.9. I don't know what was changed in 11.0, but I can almost guarantee that it was the culprit.
Rigs run combo of R9 390, RX 470, RX 480. All on windows 10, all 4gb ram, mix of amd and intel chipsets.