Calls disconnect when placing phone face down with screen off, even after hard reset

[sfetaz]

On my Verizon TP2, I shut off the screen and go to place the phone face down to use the automatic speakerphone feature. Everytime I attempt to do this, the call disconnects. I have hard reset and still occurs. I am certain the screen is off when placing the phone down. I do not believe it is the G-Sensor or accelometer because shaking the phone in any direction a lot does nothing, but as soon as I go to place it face down its disconnected.