I have no solution, but trying to thinking out loud...
I was thinking about Dropbox, because of 'adding QR-code'. If under the print options 'share via Dropbox' is ticked, it will upload the file to Dropbox, and create a QR code which takes you to that file.
See attm. (this QR doesn't work, I removed the file)
Can you get out of this loop, when you do connect to Dropbox first?
If it suddenly started, you wonder what changed?
It starts immediately when you hit Print in the left hand menu, right? At that point it defaults to MW-Schedule_1.htm. It might be that something is wrong with that file. Though if you recently installed 2022.02.0 that would be a surprise.