You're welcome, steph_giles. It's been quite difficult to diagnose, but one unexpected workaround (confirmed on two networks, it seems) we recently discovered this week: set 1Password to lock more frequently.
I set it to auto-lock every minute and the B5 disconnections virtually disappeared, versus with basically "never lock" 1Password having sometimes 40+ B5 disconnections per day.
The underlying is still being investigated in my ticket (unfortunately no solution yet to these syncing problems), but it's some respite for those perhaps suffering the same issue and I can confirm no syncing issues when setting 1Password to lock more often.
I'll update this ticket periodically and still hope for other users to submit logs or consider this workaround: still hopeful I'm not the only 1Password suffering, haha.
//
I can also share that this issue is only reproducing on my M1 MacBook Air, and no other macOS nor Windows systems.
