richierich,
OK If your player is hacked this could be causing you the problem. I suggest you try to format your player in FAT to remove the hack.
I have also uploaded 3 more test files to cover all bases
HERE.
Also using s1fwx extract and repair your firmware then load it back to your player with the MP3 Upgrade Tool.
You will find s1fwx
HERE, and a guide to using it
HERE