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I had this happen on my totally Stock Sprint Touch Pro a week or so ago....I soft reset it a few times and just as I thought I was going to have to do a Hard Reset it started working again....Not sure what happened but it has been fine since! I did, in the process of getting ready for the Hard reset, remove a small video clip that I had takin, that was showing in the Pictures tab....that I suspect might have been what was causing the problem...If you have any video stored on your phone, try removing it, then do a soft reset, and see if that helps!
Good Luck