my phone updated to ice cream sandwhich while i was asleep. and now whenever my screen goes into sleep from timing out, it wont unlock. power button/unlock button will not work. i tried downloading apps that will let me use the volume rocker to awaken the phone. nothing works. the only way to use my phone now is to leave the screen on never sleep mode. which kills my battery within two hours. i tried factory resetting the phone, to no avail. still having this problem. i went to the verizon store, and that is what they told me to do. with no promises it would work. i searched for other problems, and found nothing. phone worked perfectly fine untill update. help please?