I think the issue is some of the new security software on my new corporate laptop.
I would be interested in knowing if when disabled (if possible) what the results are. I would also be curious if a VPN connection is in the mix. If so, try adding the Secondary by IP instead of hostname, example:
If any leg of the connection is wireless, would also be interested if having them each / all wired via Ethernet has you with different results.
Stardock Support Manager