pioneer avh x2500bt losing memory

Has anybody seen this problem on this deck. I know of 3 different units that have this problem. I have sold way more 1500DVD models than the BT version. None of the 1500s are having this problem.

I have the X2500BT, and while I can't say as though I've had an issue with it completely "losing memory", but occasionally (especially on short trips) it will resume playing an entirely different song than way playing when it was shut off previously. It's almost as if it resumes playing the same song it was playing the last time it was turned on. I use it almost exclusively with a USB drive for music, so I haven't noticed any issues with tuner memory or anything like that, and audio/system/date&time settings don't seem to be an issue either.