Support unable to hang up

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http://androidforums.com – A couple months ago I bought an optimus g. Last couple weeks I have been having problems. When I make a phone call or some one calls me my screen blanks out. I tap the screen and it is unresponsive. I press the power button and nothing happens. I set options so the screen never goes to sleep. Same blank out happens. I set power button to end call. Same blank out happens. I cut off the top of my sceen protector thinking a sensor was blocked. Same blank out happens. I did a factory reset. Same blank out happens. The phone will only respond once the person on the other end hangs (General)