jef, your player may not really be 8GB. The problems you are having are symptoms of a hacked memory chip and you true memory capacity may be much less.
I suggest reformat your player using the MP3 Player Disk Tool as outlined in this post:
http://www.mympxplayer.org/how-to-re...ck-vt2400.html
This will remove any memory hack if it exists and you should not have any file problems. Be sure to backup any files you want to keep from the player as they will be deleted.