Well I switched the rigg from nicehash to single mining (Zcash) and dropped the TDP to 70%. The rigg has been stable since then..
It's not been a full day yet, but so far so good. The last week it didnt last a full night even.. I was sure it had crashed when I woke up, but happy to see it was still running.
So what do you think this means? Does this impact the riser vs psu discussion?
my guess would be not enough power from some PSU
and once you did lower your settings, that means you had lower your powers soak and PSU now is able to handle it
I'd say look here.