We have a user that upon opening documents in the morning she has to recover even after properly saving and shutting down the Libre Office Suite. Specifically when working with spreadsheets. She is using .xls format in order to communicate to outside vendors.
If you are sure, that file is properly saved (advise to make a backup) press “Cancel” button in Recovery dialog and such behavior will not be observed anymore (each morning). Something went wrong during recovery and process looped.
I suspect that you’re getting a crash on exit that you don’t see - that in turn triggers the auto-recovery on next start. The real problem is - how can we find and fix your crash-on-exit. What platform / version / etc. and/or please file a bug at http://bugs.freedesktop.org.
What would be interesting would be if you open and immediately exit LibreOffice - do you get this behaviour on next start ? and/or what event is it that causes this (hidden) crash 
I also sometimes observe a similar behavior. I am sure I saved the file but when I open LO later again or next day I get this recovery possibility. So far I never dared to cancel the recovery. Fortunately it does not occur regularly. This could be a bug to be reported.
I have the same problem. Whatever file I open in Libre Office, I have to go through the long recovery dialog, for a file that don’t exist on my disk. I have verified with find, it’s not there. The recovery is buggy now, not before.