I use the AV in windows, not a third party one.
The problem is inconsistent. Some days the problem does not show up at all, which makes it hard to document what led up to the issue. As far as I can see my setup is usually the same, QPC2 and Gmail open in Edge and either Word or Excel active when it happens. As I don't normally use floppy images myself, they came from others, so usually I don't know how they were created.