Same problem here. Only Netflix works. Channels that no longer work include Prime Video, YouTube TV, hulu, and HBO Max. I rebooted router, rebooted Roku, reset Roku network connection, uninstalled and reinstalled channels on Roku. I am technically savvy. The problem is clearly with the Roku.
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Big changes were apparently made with updates to the Roku in recent days. I have a Roku Ultra and I've noticed that coinciding with the updates you made, the performance of the unit has declined noticeably. The response of a number of apps (YouTubeTV, Netflix, Amazon Prime Video) is slower and seems to get hung up more than it ever has. It seems like more than a coincidence that it's happened at the same time as your software update. Others seem to be having similar issues. Roku might want to look carefully for possible bugs in the software update that are causing this. We've been very satisfied with the Roku units we have (including several "streaming stick" units), but our satisfaction might be eroding quickly.
After now experiencing all the slowness and errors and most of the channels no longer work (especially Discovery+ and Sling) and doing all of the steps (except for completely resetting my roku 4660x), I realize its time to buy a firestick and trash this data collecting beast roku. If they don't care enough about QA and truly testing updates or issuing a fix for this 10.5 update, then they dont deserve my business.