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Rebooting did work for me, but this can’t be the permanent solution. This has happened twice to me this week where, after doing nothing on my own, all devices are randomly disconnected from Gateway router until I unplug and restart. Aside from the annoyance of Alexa and other devices being disconnected, we have vital smart home components like water leak detectors that are not actually providing the protection we depend on when the router just randomly stops working.
and it’s just WiFi cause we can still stream to our TV which is hard wired.