When talking on the phone, the screen and sometimes the buttons will stop working. More exasperatingly, the mute button turns on and won't turn off. It alternates between being highlighted and reverse highlighted.

Afterward, some of the preset scren buttons will be simultaneously highlighted, and the phone wants to flip into Bluetooth set up mode.

This doesn't happen when using for email or talking via a car kit.

Should I return it? Is this a software problem? Screen guard screwing things up?