Local Access to Hubs over Samsung WiFi

Is anyone experiencing odd behavior with the Samsung SmartThings WiFi Hub?

As of 2 days ago, random devices became inaccessible via wifi. Epson WF-3620 printer; all 3 Hubitat hubs; Amazon Fire TV Recast.

I factory reset the my Cisco (RV345) router and all 6 of my Samsung WiFi hubs...no joy. I decided to remove SmartThings as the WiFi platform and spun up a replacement TP-Link mesh and the problems went away.

Just curious if anyone else has had a similar experience.

UPDATE: I posted this to a SmartThings support board and the comments from other people are that this is a Plume issue on the SmartThings WiFi.