How to fix my Galaxy S3 problem?

[AC Question]

How to fix my galaxy s3 problem ? Need help asap!

So last night and today my Galaxy s3 has been randomly turning off by itself. When I go to turn it on it wont. If so it goes to the logo and turns off! I need help figuring out what's wrong. I think it is needing a new battery but it might be something else./ I have taken the battery out putting it back in after a while charging it and then turning it on, I have tried the up volume button+ home+ lock button at the same time and nothing happens but a black screen and it wont turn on at all now. The phone started charging or saying it was charging when the battery was out and also turns on when you hit the phone against something! I need help asap

 

[belodion]

It sounds like a failing battery and/or a faulty power connection somewhere. The power button may be faulty too, from your description.
Check that the battery is making good contact.
If the battery is misshapen or bulging, it's failing....remove it from the phone, but even if normal in appearance it may be failing.

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