I've had my Roku Premiere for about three years. Lately, it's started dropping the wifi. I can't detect any pattern - working fine and then it drops. When I try to re-establish the connection (by setting it up again) it won't find anything until I restart the Roku device. When I restart the device it automatically connects again without me having to re-establish anything.
A couple of months ago I got a new modem/router. It's an ARRIS G36 DOCSIS 3.1 using the 802.11ax standard (which is supposed to support 802.11 b/g/n). It's connected to the 2.4GHz band using channel 1, and the signal strength is excellent. All other devices using the 2.4GHz band are working fine. I also have a Roku TV which is working fine, but it's using the 5 GHz band.
If you have access to the modem/routers configuration setup, make sure the 2.4 GHz wifi band is set to connect via at least b/g/n protocols. If just set to g/n it can cause the problem you describe.
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