Keypad Problem

My keypad was making strange noises one day during disarm (muffled beeping) - the alarm accepted my keypad entry but the red "armed" light stayted on as if was still in delayed entry but was not flashing. After a while it goes back to "sleep". I tried charging it but that disnt help. Unit is conntected and allows arm/disarm with the correct button presses, but the sound and the lighting is erratic. Any thoughts?