Yeah you could just have a defective phone with some internal issue that can't be fixed but it could be a few other things.
I had one big issue with my 8130 I just got from Sprint and the thing that solved it was a OS upgrade. It seems the phones in the store don't even come with the latest version of 4.3. So if you haven't yet go to
sprint(dot)com/downloads and then hit the PDA/Smartphone section and update your phone.
If thats not the case then it could be a 3rd party application, or we are back to a bad phone.
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