01-22-2013 04:16 AM - edited 01-22-2013 04:17 AM
This is very unusual! Try this -
When you device is POWERED ON, remove the battery for a minute, and then reinsert the battery. This make a reboot to your device which resolves minor issues with the BlackBerry device.
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01-24-2013 09:19 AM
It's more than likely not sunlight issues, but moisture problems.