@ jmattes: I also have the same problem. But (and there has always been a big but in my life I even married a few, another story).
I have 1 rig 7x rx 470 8gig, have had no problems at all, Nicehash.
I have 2 rigs 9 total running 1080 ti's also Nicehash, and have the same problem you have.
Sorry I can't give you a fix, I'm still pulling my hair out.
If you find a fix Please let me know.