I have a pro-508 scanner that i have had programmed and working for a long time loved the unit. A couple of days ago i noticed that some of the frequencies programmed in the scanner were missing. I figured i would simply reprogram the missing frequencies, ...wrong. the scan and manual buttons work, volume and squelch work, but no other buttons will work. tried unpluging it and cant make it lose the memory. and the reset button will not reset the unit...any suggestions?