Comcast, Motorola surfboard sb6141
Wireless mode on 2.4ghz is g/n only, always broadcast, wpa/wpa2, 20hz only, auto, automatic channel selection.
Recently the nest has been working in and out of the network after changing two settings on the router. I changed IPv6 to local clients only, and enabled multicast streaming for IPv4 and 6. Sometimes the commands take ~1 minute to update the nest (and this is on top of any internal delay that sometimes happens when the AC is turned on), which is longer than previously with other routers, but it does appear to be working now.
Thanks for the help, I hope these settings fix the problem. The router is starting to have fewer little quarks now that the settings have been changed.
Only other issue I have been having is with my iPhone. If I enter passwords for both the 2.4 and one 5 Ghz network, and the phone switched over to the 2.4, the internet does not work. I have to reset the wifi on my phone to get the Internet up and running again. For now I just don't have a password entered for the 2.4 network. Hopefully this issue will be solved in the next firmware update.