I have a samsung Android infuse 4G. and my phone keeps shutting off. Everytime when I on and I am searching on Google or looking a web site and right in the middle of it, it will shut down and then when I turn it back on my battery is in the red.. when it was fully charged.. I will be on for about 5 min or less and then shut down.. Just a few min. ago I went to text and it shut off.. I am getting really tired of this.. What can I do to stopped this.. need help.. I need my phone..