This morning my phone appeared to be dead for all intents and purposes. It would not respond to charging and everything seemed inert. I pulled the battery and started it again and it started up normally at first but with no notification bar and after about 40 seconds the screen died without warning. The screen is cracked but it has worked well till now. Also, if I pull the battery then instead of starting it just charge it I get the battery indicator normally. What do I do?