having the same problem, MM worked fine until my SD card was defect.
Did a fresh install with Raspian Buster and MM 2.8.0
since then the temp. is always near 80 degrees (showing the thermometer in the right corner).
Electron is taking 100% of processortime. (already using the fake kms driver).
taking the top off the case, and a heatsinks lowers temp a little bit, next step is a cooling fan, to see what that brings.
also the monitor on/off problem is back again, had that solved in the old situation.

Looks like the ANWB feed is not there anymore, the url is not valid anymore.
Module does not work anymore