Don't know if its been mentioned... Has anyone experienced where the phone's screen becomes unresponsive on the lock screen? (I hit the power button, screen came on, I went to slide unlock and it wouldn't recognize the fact I was touching the screen. So I held down the power button for reboot, still no response. So i had to do a battery pull) Also, right after that happened, I had no cellular connection (Voice or Data) for a couple minutes. Eventually it came back on. Anyone else experience this?