Phone stopped making calls until reboot

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http://forums.androidcentral.com – I picked up the phone to make a call, and it wouldn't. It'd sit on the screen saying "Dialing..." but nothing ever happened. After about 30 sec, it'd say, "Call ended." I tried four different numbers, and also turned off wi-fi just in case. Finally, I rebooted it. When it came back up, it made the call just fine. I even turned Wi-Fi back on and that didn't cause any problems either. Any idea what may have caused this? I don't have any power savers or task managers that would interfere with calls. Rob (HowTos)