A family of Microsoft presentation graphics products that offer tools for creating presentations and adding graphic effects like multimedia objects and special effects with text.
I am experiencing the EXACT same problem. Whenever I return to my computer from sleep mode - all my PowerPoints and MSWord documents are gone and the programs have self-terminated (closed). This is infuriating, as I have lost critical work. I have run MSOffice for years and never had this problem. I just purchased a new desktop (Dell Insperion) and purchased the MS Office suite in Microsoft 365. I never had this problem before. This appears to be a MAJOR "bug" and one that needs to be addressed by Microsoft ASAP.
A word to the wise....SAVE OFTEN and DO NO allow your system to sit idle for any amount of time or you WILL lose your work.