I recently purchased a new home, and with it a new Asus RT-AC68U router, and two gen 2 Nest learning thermostats. I’ve been fighting Nest offline/disconnection issues with my Nest thermostats since I got installed them, and finally found the answer after hour and hours of Googling. This fix should work with any Asus router, such as the dark knight RT-N66U, RT-AC66U, even if you use the Merlin firmware (which I use). I will note that in attempting to fix this I also assigned my Nest thermostats DHCP static assignments, but that didn’t help with disconnects. Oddly in my previous residence I had a Linksys E2500 and a single gen 1 thermostat and never had this issue.
I spent an hour+ on the phone with Nest level 1 and level 2 support and they didn’t really have an answer, but led me to narrow down my options.
Even with my previous fix below, my Nests still disconnected all the time. I kept reading forums, etc., and now have the following settings, which seem to be working:
Beacon Interval: 211
Enable WMM APSD: Enable
Seems to be working. We’ll see long term. Lots of people are having issues with 4.3.3 and 4.3.2 and WiFi disconnects.
Unfortunately, my thermostats still go offline intermittently. I really wish Nest would get their s**t together. My thermostat is wired with power. This issue is seriously annoying, and is pervasive.
They mentioned that WMM sometimes creates issues, and I immediately gravitated to “WMM APSD” in the “Professional” tab of 2.4GHz. I disabled this feature and I have not had a drop off since. Set the following parameters in your “Wireless”, “Advanced” section for 2.4Ghz: “Enable WMM APSD” and select “Disable” For the record I also have “b/g protection” in “General” off as well, but I’m not sure that has anything to do with it.