I believe the problem is from flaky solder connections, these miners are plagued with them. I have found the problems tend to show up more often when cold, then when you warm them up thermal expansion can close the flaky connection enough for the miner to run. You may be able to limp along for a while, but in my experience, it is just a matter of time before it starts failing solidly and won't come up even when warm.

The same issues can cause the temperature sensor issues. Sometimes all the downstream sensors from the place where the issue is start having communication errors.