High processor/CPU load on iPhone, draining battery, how to fix? My iPhone sometimes gets very hot and drains battery extremely quickly. When I use the app iStat to check processor load, it shows high numbers (above 2, where it is normally 0.5, not sure about the format of those numbers but that is what is reported). It seem to be the equivalent of a computer stuck at 100% CPU load.

Restarting the iPhone and closing all apps does not help. Previously, it went away after a number of restarts, but this time, so far not. Do you know a way, except re-installing, that can fix the iPhone? Any app that can kill all processes?
Do you use Exchange on your iPhone? At our company we have some trouble with contact sync every once in a while. Various iPhones will run at 80% CPU and their batteries empty in about 2 hours.

One temporary fix is to turn off contacts in Exchange Settings and turn it on again. Then contacts will be sync again and after this CPU runs at a normal 5-15%.