Just to add more clarity, I've had this problem on and off with this rig for a quite a while now, it's not a recent thing. I've finally just gotten annoyed enough to ask for help to try and troubleshoot it. It happens whether I'm using Claymore or DSTM. Currently it's running DSTM. I'll definitely try lowering the OC settings, I've been lowering just the most recent card I added, but it doesn't seem to be helping. I'll lower the settings for the whole rig and see if the problem goes away.
Thanks for the quick reply!
I wanted to provide an update. So I lowered the overclock settings with no success. In a few hours the same problem surfaces again. It's still mining, but appears offline in SMOS dashboard. During this time I was using DSTM v0.6.0 to mine BTCP. Yesterday I switched to DSTM v0.5.8 mining ZelCash and it's been running for 24 hours now with no issues. That's on my original overclock settings. So I'm not sure what's going on. I'll try upgrading ZelCash to DSTM v0.6.0 and see if it comes back. Or maybe it's just the difficulty of BTCP causing the issue?
Yup, switching to DSTM v0.6.0 caused the problem with 3 hours. Going back to v0.5.8 to validate if it's stable again.