MP3 Player Problems

I have a Omnitech MP3 2G I tried to add a song the other day and the thing just quit. No songs and the computer didn't recognize my device I solved that problem from last night and I got it to work. I did a format (FAT) That was great but... I can only get 116 songs (440MB) on it now. A stop sign pops up and tells me that the file cant be created no matter what song I try to send to it. I'm assuming the thing is full. I had well over 200 titles on it before and 440 MB isn't 2G. I just checked the properties and there is 1.5 G left in the memory. I also did a full format and the same thing is happening.