Sinope has native Control4 zigbee thermostats which work with hydronic or electric radiant heating. They must be purchased by a Control4 dealer-
https://www.sinopetech.com/en/control4/thermostats/
I've upgraded several systems to 3.4.1 and have not run into this issue, so my guess is that its something specific to your environment. Are you sure that all components (controllers, touchscreens etc) are on 3.4.1? I would probably recommend reflashing the controller to 3.4.1 and loading a backup. Perhaps something got corrupted during the update.
yeah it should be pretty near instant, sometimes I send a Refresh Navigators but I'm not sure if that really does anything, and it sounds like you've already done that if you're seeing it in the app.
that doesn't seem to work. I just tested it on a system, that variable (IS_CONNECTED) is only available on the individual thermostat drivers, and returns a value of true, even though the Ecobee Network driver properties is telling me that there is an error refreshing the token and I need to get a new pin code. I don't think the individual thermostat drivers actually update to be offline when this happens...
Frame TVs work okay as long as you identify them using their IP address, they have an issue with using SDDP as they sometimes (more often than not) come online with an "unknown-Mac" in their SDDP address.
Your options are to expand the box to be a 4 gang, or add 2 switches to the wall on the other side, if you are lucky enough to have the other side be somewhere hidden (closet or something). Or fish wires to a nearby cabinet and put some switches in that.