Iphone 3gs shuts off randomly.what do i do?

It will shut off and i can't start it. I try to start it by rebooting (sleep+home buttons). Won't work.then, about 4hrs later, i can turn it on. 6 hrs later, its off and won't turn on again.repeats all the time! What is wrong with it?

I'm guessing you have had it a long time and its probably dropped multiple times now. I've never had an issue with my 3gs but its possible you could have damaged it.

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