My iphone just turned off and is not turning on?

I was just playing angry birds and my iphone just turnes off i was very scared this was for first time but this happen for more than 20 timea in month i turn on it by hitting it on ground throwing it every time i hav tried every thing every glitch(home+sleep button) every thing please tell me how can i fix it by hitting there are many chances to be break some thing in it i please

Have you tried hitting it really, really hard?

or system reset: hold down top button and home button for 30 seconds.

if this doesn't work use hammer.

So you tried home+sleep? How long did you hold them? I had to hold the two for ten seconds before it worked.

Restore it

Plug it in to your computer/ laptop then try the home+sleep button for ten seconds if that don't work take it to the apple store better to have someone look at it rather brake it.