https://www.pcgamer.com/popular-antivirus-software-may-corrupt-dark-souls-remastered-save-files/

Image credit: Reddit user Empathy_Crisis. 

As detailed throughout the Dark Souls subreddit, Dark Souls remastered players using both BitDefender and Windows Defender have reported corrupted save files, indefinite load times and instances where cloud sync services—Google Drive, for example—interprets save files as "in use" and therefore makes them inaccessible.