I noticed it multible times today.
No idea if it have something to do with your performance problem, but this should be fixed fast.
I uploded pictures, changed multiple files and switched projects.
After some time projects gets rollback and all the changes are LOST.
not only the code is rolled back. the uploaded pictures got deleted.
sorry but this is a no go. i think u should really check ur save machanic. auto-save is okey, but let the user now if it got really really saved or just fake saved.