What does MS say when you report these to them? Is it always the same bug still unfixed or separate issues? Nothing is infallible with software, but note that in ops case autosave was disabled so no mystery "autosave lost my document", it was just disabled.
And ffs autosave is just a timer that saves the document every x minutes the same way a user would do if they pressed save. I do believe you get many issues reported to you, but I doubt Microsoft autosave is so buggy to cause an unbelievable amount of data loss in a single institution (and I love to shit on MS).