a low level exception occurred premiere importer mpeg (importer 81)

It never happened to me before, but in recent months I often get the error message "a low level exception occurred premiere importer mpeg (importer 81)" (and different numbers like 39 for example) or "premiere pro running low on system memory" I tried everything I found on this forum: turn off HW acceleration, clean the media cache, dedicate more RAM to the program. Premiere Pro is updated to the latest version, I have Windows 11 PC with i5-10400F and RTX 3060 Ti and 32 GB RAM.