Jeff,
Since you are using bridge mode, try adjusting down the MTU supported through the network. We have observed that a realistic MTU for Verizon 5G home internet is about 1428 bytes.
Good luck,
Tom
Diagnosis was obscured/hindered by figuring that the most likely suspect was the thing that changed most recently...
The upshot here is pilot error (well, control-tower) in that my ssh access to that site was restricted to my Xfinity address. Application, not firewall. Can't blame Verizon for that! I can blame them for a little UDP congestion there, but that's probably normal.
Thanks to everyone for their suggestions. At least they helped eliminate suspects.