My iPhone 4s Touchscreen is sometimes unresponsive to receiving calls

Sometimes when a call comes through my iPhone 4s won't let me answer the call. I can't slide the 'slide to answer' switch. Pressing the home button seems to help after a few presses, but maybe that's a coincidence. Is anyone else having this problem? I had the same problem with my iPhone 3 and so I am worried it may be a software problem.

Unfortunately, there isn't anything you can do, unless you are using the computer you normally sync with. If you are, you should be able to backup without unlocking the phone.

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