IOS 5.1 update causes my iPhone 4 to reboot in multiple applications

Ever since the 5.1 update, my iPhone 4 reboots in the middle of trivial tasks (Messaging, for example). I performed a reset, and it rebooted when i tried to put in my passcode.

I thought that I had bricked my phone as well when I upgraded my iPhone 4s to iOS 5.1 but I just fixed it last night after 3 hours of trying everything. My phone was stuck in recovery mode and had the icon telling me to plug it into iTunes, but iTunes didn't recognize my phone at all. I tried everything from uninstalling and reinstalling iTunes, but still nothing worked. I tried changing the USB port that I plugged my iPhone into and THAT is what worked. I have no idea why, but my computer finally recognized my phone, but had to be restored. Luckily I had a very recent backup so restoring it wasn't so painful.
Try changing the USB port where you plug in your phone on your computer; hopefully that works for you!

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