New - RBR850 / RBS850 Firmware Version 4.6.8.5 Released

I have used the RBK53 for several years with one router and three satellites and never had an issue with the Nest thermostats.

I upgraded to the 853 and both Nests disconnected and ran down power several times a day from day one of the install.  I kept testing for days.  Charge them back up and see if they lasted longer.  They never did.  Both would drain and disconnect.  Then I seen a post about the work around of doing the guest network.  I believe you commented on it a year or so ago.  I added a guest, connected all the Nest Thermostats to it and never had an issue.  I just upgraded to the 4.6.8.5 hoping that was the fix.  As a test, I only moved one thermostat back to the Primary and it ran the power down over night and disconnected.

With the 853, I have one router and two satellites.  The router and the Nest that disconnected after this upgrade are on my second floor and about 15 feet apart with 1 sheet rock wall between them (not brick, concrete, stone, etc).  The two satellites are on the first floor over 100 feet away, through the floor and several sheet rock walls.

I only seen the thermostat connect to the router.  Why would it jump on the primary SSID and not on the guest?  I don't see an option for fast switching like I did on the RBK53 which I did have enabled for years.

Any advice would be greatly appreciated.  I don't like having a second network.

Thanks in advance.