Wi-Fi & connectivity

[MagicM]

After the most recent update (14.0.4 build 12221), I noticed my 4800x Ultra showed a connection speed in the high 80s to low 90s. Prior the speed was in the 200 range. I checked my router and the ultra was connected at 2.4Ghz instead of 5Ghz. All other WiFi devices in the house were connected at 5Ghz. My router is set up to automatically connect at the highest speed that the device supports.  I configured a new 5Ghz only network and lo and behold the ultra couldn’t see the network.

Roku, please fix ASAP and stop breaking stuff. 

[JWS9518]

Try powering off your router and Roku for 30 seconds and see if that helps.

[AvsGunnar]

@MagicM 

Have you verified that your 5ghz band is configured to use n/ac "wireless mode" ?

If using a wifi6(ax) router, enable a mixed mode of n/ac/ax.  Then try disabling the 2.4ghz band and see if the Roku device now finds the 5ghz band.

Currently, only the Ultra 4850 and Roku-branded RokuTVs can take advantage of the ax speed protocol.

If still having issues, feel free to post back with router model number and ISP (internet provider) and describe your router settings/configuration.

[MagicM · Accepted solution]

@AvsGunnar 

Yes, I had already double checked that "n/ac/ax"  was enabled.  After some more research and stumbling across the below in another post, I disabled "DFS" on my router and that corrected the issue.  Still seems a bit weird that the Ultra was previously connecting fine to 5Ghz with DFS enabled (the default) on my router and that it started to only connect to 2.4 around the time of the latest roku update.

"The nine 5 GHz channels supported by Roku devices are 36, 40, 44, 48, 149, 153, 157, 161, and 165.

The channels assigned to the 5 GHz band in ranges 50-64 and 100-144 are shared with other uses such as military, radar, and weather. These channels are termed DFS (dynamic frequency selection) channels and routers are supposed to automatically switch to a different channel if they detect one of these channels is in use in your area. Roku and many other home use devices don't support these DFS channels.

Many home routers don't include DFS channels, but some do. Make sure your router is not using these DFS channels, and that it is not using an auto select option that could choose a DFS channel."

[AvsGunnar]

@MagicM 

Next step is normally to try disabling DFS for troubleshooting, but the 4800 does support DFS. (50-64, and 100-144).

https://support.roku.com/article/21332729601687

May just have to verify that your router is not using DFS channels outside that range when using Auto channel selection 

Unless you need to use DFS (very congested areas) normally sufficient to just use non-dfs channels for device compatibility.