Sound on my Keypad was going and is now gone

About a week ago when I'd key in the buttons on my Keypad it started sounding kind of fuzzy and different. The beeps from pressing keys and the "home and armed" or "disarmed" would come through distorted (picture a robot fighting to stay alive in a movie). After about a day or two, the sound completely stopped on my Keypad. Buttons still click in the code and it still works, but the sound stopped. I tried charging it, but it was almost fully charged; and the firmware says it's all up to date. Anyone else have this issue and if so, how'd ya fix it??