Re: has there been any news on WHY they catch fire?
This exactly!
Plus why do many of the "eruptions" take place just after power is switched off or the device has been taken off charge? That power & ground short may be through a badly managed diodeless buck convertor using synchronously switched MOSFETs instead (let both on at the same time and direct battery short though small inductor on a high-current handling path)....
...at least that's where I'd start looking in debugging.
Biting the hand that feeds IT
