Odd ... The only thing I can think of is that you are running out of memory. That is, when a reboot helps that is a kind of logic.
On that matter, try setting "Split file at size" (Settings Area) to 100 for a while (but maybe you already have that ?).
But when does this happen ? At start of playback ? in the middle of a track ? at the end of an album ?
But if anyone else has this, please let me know.
The "data" like Playlists and everything reside in the folder you denoted with "Data Folder" (Settings Area). When not set it's the folder where XX resides, and then indeed you'd be loosing it when you install to a new folder.
This data folder should not be a sub folder of the XX folder, because then you'd have the same problem.
If it's not clear, please let me know !
Peter