Hey guys. Four days ago I bought a brand new LG Optimus LGP990 (optimus x2). Everything seemed to be good, but after a couple of hours the phone prompted pin code. I entered it and I didn't think much about it until I noticed that I didn't receive any calls or text messages. I rebooted phone and things worked as usual again. This occurs about 6 times a day, and reboot is the only way to fix it. I went back to the store and said it was as this when I got it. They gave me a new LGP990, but the same problem happen with the new phone I got. I didn't install any applications, and I even did a factory restore with the same result. I thought it could be the batch the store got, but they had sold several other phones of the same batch and no problems was reported. Could it be my google account/a contact or something corrupting the OS?