Thanks. I checked it out via Google -- it's not obviously similar to anything I'm familiar with. My only advice would be to see if your player has a "reset" button -- usually accessed with a paper clip through a small hole in the body. After a reset if you still have missing memory try reformatting your player. These are steps I'd take with my players, but I don't know if/how you can do them with yours. The only online manuals I could find were in Greek -- I'm afraid I'm barely literate in English.
By the way, I probably don't have to tell you that Google brings up a lot of people posting about problems they're having with this particular player.
Wish I could be more helpful.