Disable/Configure DFS Channels
Some devices don't recognize 5ghz networks on some or all DFS channels. This forces the devices to 2.4 ghz which results in inadequate performance. Devices that appear to be affected are Roku and Firestick devices. In my case, the 2.4 ghz speed is inadequate, whereas 5 ghz works fine when Eero assigns a lower channel number. At channel 100 Rokus can't even see 5ghz.
We have the same issue with our Roku. What model Eero do you have?
My understanding from this DFS announcement from May 2020 is only Eero Pro models have DFS enabled.
So as much as I’d like to see a toggle switch to ensure DFS is off, I’m assuming my Eero 6+ doesn’t have it and the Roku not connecting to 5 Ghz is another issue.