Problem: I save projects but it doesn't save them completely

Dear friends,
I have this issue with my mpc 1000
i make a program with different samples, i save on a sequence different tracks, so i can play with track mute and so on.
Then, I save everything in a new folder.
When i start the machine again and i load, sometime it load everything correctly.
BUT other times, it doesn't save correctly. Like, for example yesterday i saved the project i was working.
It was the second time i was working on that project so the first time was saved correctly, and I had 5 tracks recorded.
Yesterday i added like another 5 tracks, and saved the project and overwrote it.
Today when i opened the project, only 5 tracks are recorded on that sequence, so basically i lost all my work of yesterday. Just the new samples are saved in the folder (at least).
This is getting really annoying because i cannot rely on a machine which doesn't save correctly!

ANy suggestions please?

I am using JJ OS:3.16
Extreme compact flash sandisk 8gb
60mb/s

Thanks a lot for your support!
Daniele

Are you loading the folder or the project file? I find if I load the folder things load strangely, but if I load the project file I don't have any issues.

yes, i load from project file.

yes, I usually save entire memory!
I overwrite the project.
but still, some tracks are gone

yes, i am saving to the same folder.