Yealink RoomCast Zoom Room disappears from Airplay visibility at same time every day

[ctawes]

I have a bizarre think happening and I can't figure it out.

I recently purchased 3 Yealink RoomCast appliances licensed for and running Zoom Rooms. The plan is to use these as both digital signage machines and airplay receivers so that our teachers can mirror their screens. We have six total Zoom Rooms (Logitech Taps/Windows NUC) that work more or less as expected. I've also purchased a handful of Azulle Ally windows appliances with Zoom Rooms to do the same thing. They perform their functions, but are a bit tricky to manage. 

The weird problem I'm running into is that the Yealink Devices work as expected from 8:00am EST until about 12:00pm EST. My teachers can airplay to them and all is well. By 1:00pm EST, however, all three of the Yealink devices disappear from being seen by any of our Macs or iPads or iPhones. The device is still turned on. It is still visible and controllable via the control panel at zoom.us in my account portal. I can reset it or reboot it...but it stops being visible for Airplay Screensharing for at least 30-45 minutes. As I type this, they just came back into visibility. This happens daily. All of the system settings in Zoom are identical to my Azulle and Logitech appliances, but only these new Yealinks are dropping from visibility. Has anyone seen similar behaviors on their Zoom Platforms? Does anyone have a handy solution? Thanks!