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I went through the installation process about 10 times before I decided to go buy a high end third party router from Amplifi. That didn’t fix it. Arrrgh. Finally after googling it and taking some time I figured out that the Nest Smoke alarm isn’t smart enough to distinguish a high GHz wifi network from the old low GHz wifi network and because the router from Teksavvy (which I think they got from Rogers) was installed with trying to pretend that the two networks were the same and gave them the same SSID.