As I said above, every now and then I open Acrobat to find all my settings (page view, tools, etc) reverted to standard.
This is quite annoying as it takes some time to reinstate everything.
i’ve also noticed that it is impossible to uncheck the auto-update in preferences. If you reopen the prefs panel it’s activated again.
Sorry for being late in answering your query.
Could you let us know the operating system you have on the machine- Mac/Windows? Is it a personal machine or an office machine?
Try selecting "Restore last view settings when reopening documents" under Edit > Preferences > Document section and check if that resolves the issue.
Let us know how it goes.