OK, since the other thread was getting long, and the problem is still not resolved, I'm starting a new thread.
Windows 10 primary, 22H2 (company PC, not upgradeable), M 3.6 (not upgradeable). Windows 11 secondary, just updated to 24H2 a day ago after putting it off, and thinking that I may have identified the issue with the outdated ethernet driver and possible Backblaze interference. Came in to work this morning and the secondary is dropping off the primary every 30 seconds or so, making it impossible to work.
I need a Stardock solution to this.