hi there, did you solve the problem already? if you aren't I've face the same problem with you when building my 1060 RIG, and with MSI cards too.
from what i've seen, looks like you OC the cards high enough to get 20 Mhs. I've ever experience the NVML error and looks like a bad OC causing it. you can try to lower the OC, and use Claymore to try to mine ETH. If the problem still occurring, try the restart miner on the Claymore ETH miner, in my case I set it to 30 mins, so once in 30 mins my miner restarted and its been 2 days since I did that, no problem at all. you can try it mate
from what i've seen, looks like you OC the cards high enough to get 20 Mhs. I've ever experience the NVML error and looks like a bad OC causing it. you can try to lower the OC, and use Claymore to try to mine ETH. If the problem still occurring, try the restart miner on the Claymore ETH miner, in my case I set it to 30 mins, so once in 30 mins my miner restarted and its been 2 days since I did that, no problem at all. you can try it mate