"?sample" lost... help please.

I read about this problems many months back but cant remember what the cause is. Ive had a handful of samples I made a couple weeks ago. I have been saving them individually or "save entire memory" like I used last night. Just all my current work, each sample either says cannot be found or it has a question mark by it, in my experience that usually means it was edited or deleted? I didnt change it though, its a mystery to me... this is JJ OS 3.06

what i do is SAVE PROGRAM wit all the samples off a peticular record...it'll save all ur samples into memory unless u already have some saved and it skips those EX DRUMS/BASS...
other than that damn...u got the same mem card in right?

Yeah same memory card, I didnt really change anyhting. I know "save entire memory" atleast for me... doesnt always save "everything" I'll save individual programs or samples if its something important, it was already saved... I played a few beats saved entire, shut it down... now all my new stuff isnt showing up, poof....

when i first started i **** up cuz i didnt name any samples and when i saved them sometimes it didnt over write or it did over write and certain sounds would come back all **** up