Never happened to me in 10+ years of using LibreOffice. But after the last update every few days when trying to open some document it would show a popup to recover some other file that was opened yesterday. Although, nothing seems to be wrong with the file. There were no system crashes or app crashes. Seems like some bug that triggers recovery process out of blue. Happens with Writer and Calc.
v25.8.1.1, Windows 10