Oh the irony. The morning after my last post above one of the switches dropped off the network. So while the situation seems to have improved it is by no means solved. However, the Nighthawk R7000...

Since there was nothing forthcoming I decided to play around a bit more. It seems the HS100's are stable on the network and believe this should work for the HS105's. But this is going to be specific...

I had HS100's attached to a Virgin Superhub 2ac and they never dropped off the network, were always accessible via Kasa and Alexa. Unfortunately Virgins router was beginning to struggle with so many...