In the past 24 hours I have had to reset my phone twice after it locking up on a call. It happened both times during a call using Bluetooth in my car. My previous phone didn't have any issues . When the problem occurred the screen goes blank and the power button doesn't do anything. I could hear the person on the other side of the conversation but they couldn't hear me. I had to actually remove the battery both times to reset the phone. Anyone else with this experience?