OK, my N900 charges from PC pretty well, while does not charge from other sources when its battery is too low, though does usually charge when battery is above 50%. I suspect it is USB port problem, since device was reflashed recently and has no other problems. USB port doesn't seem to be very loose, though, at least not looser than cheap phone copies that do charge pretty well, but I can't figure anything else that can cause the problem.

First of all, should I be panicking?

Secondly, I have a soldering station and a chinese iPhone 5 with broken USB to get some practice...