I can confirm that the problem exists. Doesn't seem to be a problem if saved manually, and I'm not sure it always is on autosave (my test docs seemed to be still there). Maybe it is an issue only with open docs or with docs that are open in their own window.
Lost some stuff on the last crash which had been there for over 12 hours.
I've not experienced any autosave problems with other programs.
The 'crashes' are of the system freezing and having to be restarted.

Yet another document has disappeared! it was present when I closed the database earlier this evening. I worked in my other DoogiePIM database for about five hours, closed it and opened the previous database. The document was gone. I imported the .DON version of that document which I had created as a backup. Shuttling .DON documents back and forth is not a promising future.