Have the same problem with wifes phone, you have to remove battery and re-install to get it to work again. but when you plug it back up to re-charge same thing. trying to figure out whats up. has to be phone issue of some sort. keep us updated and will do the same on out come.
Hello nuthousehome, and other welcomed posters. if you seeing a message that the battery disconnected while attempting to charge the phone it may be related to a hardware failure, and having the phone evaluated in a sprint service & repair center will be the best way to handle this situation.