I've been curious what sort of Overtemp protection the Avalons have, if any.
If there is one, you might be on to something with his inlet temp being 42. which is 2 degrees above the specs, so you're living dangerously with good old warranty stipulations.
If 95 is the shutoff, maybe it resets itself once it drops a few degrees below that.
GHSmm[8049.54]
If this pointing to his Hashrate at the time taken, if so he is hitting it's full potential so it appears to be hashing just fine.
Vi and Vout looks ok, so the PMU is not the problem.
Learning question for myself, does PMU refer to power managment unit??