dout this is normal what's going on, and I think it might be my battery itself but maybe you guys can help me out with this. I recently got a Samsung i730 from a buddy who don’t use it no more, anyways it has a few problems with it:

1. sometimes it shuts down on its own when I’m sending a txt (this happens really rarely though)
2. When I slide it open quickly it shuts down
3.when I’m talking to someone I can barely hear there voice.
4. the phone signal mode turns off on its own after the phone goes on standby

If someone els had these probs and this was already discussed then I’m sorry for reposting but I would greatly appreciate if you guys can help me with this. If it is a battery problem witch I hope it is then I’m going to just buy me a new one.