It turned out the owner had installed some apps that kept the unit on and busy. It locked up. Some call that a design flaw and we'll let them carry on. For the folk we helped with this we went back to stock on the apps and then installed apps one by one until we found out what it was.
Sometimes when my Galaxy S2 is in the pocket of my pants and I get it out to unlock it, it won't switch back on. I'm afraid it gets too hot when it's in my pocket, but I don't know for sure. This has happened 3 times now, and I'm not happy with it, because this means I can't have it in my pocket for longer than 10 minutes.
Is this common or a fabrication error?