I have also been having problems for 2-3 weeks. I have gone thru my setup (atleast at the wall connector) and no lose wires or signs of damage. I was already on the 0.8.54 and having the failures. Nothing appeared hot after inspecting under a breaker-off state. After some investigating, I am beginning to think this was more related to a change in voltage from the start of the charge to full current, and the wall connector interpreting too big a drop as a lose wire (and thus presuming overheating might occur). I am seeing about a 7-10v drop from panel to car (on 6awg wire) - so I have some investigating to do.
All this being said, I received a firmware update sometime yesterday to 0.8.58.g2f475f6c93fd79, and for the first time in weeks I was able to complete the charge - start to finish without overtemp faults. The charge did reduce the current to 20A (my setup is configured for 40A on a 50A breaker). I suspect I still have an issue somewhere with my circuit due to the voltage drop, but no overtemp faults after 1 cycle - fingers crossed! Will update here.