Based in your logs what I see is that the two hashboards are overheating and your tmax is reach more than 85c this can cause miner to stop hashing.
What I would like you to try is to cool down your miner try to put extra fan and make sure to exhaust hotair/heat from the room.
You can also run the fan at 90% or full speed to help hashboard to cool down.
You can use this command below to increase the fan speed.
[{"command":"ascset","parameter":"0,fan-spd,90"}]
You can submit this command using FMS under diagnose.