Today, I made a call and the party on the other end was not answering. So, I tapped the red "end call" and nothing happened. There was not feedback from the phone at all. Other end kept ringing. No response anywhere on the phone. Soft keys would not respond--Nothing. Had to press power key and power off, then reboot. Has anyone had a similar occurrence ? If so, is there a fix for this? I have never had any other phone act like this.