Spontaneous reset during call with Iphone 3GS running iOS 5

My iPhone 3GS crashes almost everytime during a call.  When I'm calling some-one or some-one is calling me the phone suddenly resets after 2 or 3 minutes.  Is this a HW or Software problem.  In my diagnostics list I see quite some panic messages with CRC errors.

"Spontaneous reset" - maybe you mean spontaneous restart - the phone can't reset itlself.
Could be either hardware or software.  Restore the phone in iTune using a backup and if this continues restore as new, without using a backup.  If restoring as new doesn't help, there is a hardware issue.

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    Picasa (picasa.google.com) - Open a free Picasa account. Purchase the MyPics app for the iPhone (not free, but inexpensive), and upload all of your photos to Picasa using MyPics
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