My Samsung Infuse constantly shuts itself off without warning but always comes back on. This time it won't. It is stuck on the black screen with SAMSUNG flashing on and off. I tried taking out the battery, leaving it out for awhile and putting it back in. Before I even try to turn it on, it's starts flashing SAMSUNG again. I've tried holding the power button down and still nothing. I havent tried to do a hard reset yet because there is stuff on there I want to try to save if possible. Any ideas what's wrong or what I should do??