I had a similar issue with my PRO-106, just before it stopped working properly.
After the scanner using the same files (and I do switch the loaded files from time to time) for over a year, I suddenly started getting heap errors...I tried the "0" then "1" at startup, reloaded my files and that seemed to do the trick for about a week.
Then, out of the blue, my scanner would no longer work with the ac/dc adapter plugged into the side. Neither the one I use in my truck, or from the wall wart at home. But interestingly enough, it works just fine when running on the alkaline batteries alone.
Not sure if its related, but after the scanner using the same file for well over a year, it makes me wonder...