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While browsing the internet with my iPhone 4S the screen goes black and it looks like it's turning off, but it pops up to the unlock keypad screen. It has plenty battery and I was wondering if it is an issue of using too much of the iPhones RAM or not. I have no other apps open besides Messages. I am getting kind of worried as it started around two weeks ago and it has gotten increasingly frequent.
Basic troubleshooting from the User's Guide is reset, restart, restore (first from backup then as new). Try each of these steps in order until the issue is resolved.

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