Screen Goes Black When Using Bluetooth

[gabato]

On my EVO 4G, my screen goes blank when using my bluetooth. Is there a setting to change this? Note: the proximity sensor is not covered.

 

[asphaltman]

Mine does it too. It does it when I am connected to SYNC in my truck... Very annoying. Its not a matter of even touching the phone or anything near the prox sensor, but when on a BT call it goes black within seconds.