Originally Posted by digitmasher
Before doing an OS upgrade you might want to do a Master Radio Reset. This is in your security settings, once you are in the "General Settings" portion of the security menu, click in on the scroll wheel and select "master radio reset". When you are prompted with a confirmation message select "yes" to proceed and then when you are prompted for the password enter the number zero six times and press enter.
After you have performed this operation you will need to go back to the home screen and to turn the wireless on.
I'm in the twin cities of Minnesota. To perform a master radio reset on our 7520's we use a password of four zeros. Apparently this password is different based on your location. I agree that this is a better first step than upgrading the OS. After a master radio reset I advise removing the battery and reinserting it after 30 seconds or so. If that doesn't resolve it, you could try a hard reset by removing the battery and holding down the power button for 30 seconds then put the battery back in. If these items do not help try the OS upgrade I mentioned earlier.