Are they in your media library or otherwise in a resident playlist? The new playback statistics component will forget tracks it hasn't seen for 4 weeks or more. Tracks which are in an active playlist or in the media library count as seen.
after looking at more files, that have NOT been reset...they do however have their "last modified" on the file data listed as oct 12it seems around 30% of my files are like this. the rest are normal