@martinlink Personally not aware of known temp issues with the XR platform. Do you have any high res pics of the bms just in case I can spot anything that looks a bit off?
Being 4209 there's quite a lot of options if it is the BMS that's faulty. Hoping your thermistor swap worked but if it is the BMS there's probably a good few people in a local ride group with a bunch just laying around since most swap them out when vescing and have no other use for them.
For other checks I'd try probing between ground and each one of the thermistor pins on the BMS while it's disconnected from everything. All should return a similar reading to eachother. If you find one way out of line then that's where to start looking by tracing back that one pin to a component like a cap that may have gone bad or been knocked at some point.






