lost work!!

i was working on a beat yesterday and i did 5 tracks, i saved entire memory and came back to it a few hours later and it only loaded 4 of the tracks. i loaded it up today and it only loaded 3 tracks. im using akai os2.11, do you think that is the problem.

It could be... Can you see the files on the card via CPU?

you may also have a program in your song just called Program01... if when you load, you do not select to overwrite existing files in memory, it will play from the blank default program01 and there will be no sounds from that track... that might be the case.