I have found as my Pro-197 and Pro-106 have aged they both have become very "quirky"... they will play for a couple months flawlessly and out of nowhere develop a "heap error" and are unusable until i reload the v folder or resend the programming from the computer, then all is well until the next episode. Also they are more prone to the problem if they are turned off and on every day... so I mostly leave them on 24-7 and just turn them down if needed. And if we have any electrical flicker/surge they loose their talkgroups and go into "heap error"...
I actually like the audio of them better on P25 than my Unidens, which I've never had anything like this happen on them, but they can sure be fickle..