heap error

First error with my PSR-500. Worked fine the night before, was listening to the TG's working the President's visit. Next morning, it turned on OK. But when I pressed any button except the light button, it would display "Heap Error" with some numbers in the line below that. Did some testing by...

I began getting this error message this morning when attempting to lock out scan lists: Heap error 239221: 2399 Everything had been running normally before