I don't think it is the fast charger per se...because some people use the fast charger and their phones do not get that hot. The problem is most surely heat related from "using" the fast charger but I think there's some other wiring, soldering, or hardware problem that is causing the extreme heat that is frying the accelerometer. I read where some phones get very hot when doing a combination of things like using the GPS and some other app at the same time which also could burn out certain components. I think the problem is with the accelerometer itself, or maybe just a bad batch of them and the flaw is exposed by too much heat no matter how it's generated.