Most people think all Rokus are the same and don't even mention whether they have a separate Roku device or a Roku TV in their posts to the Community, let alone their Roku model or model number, so anecdotal information is sadly limited.
But I've seen lots of complaints from many models, including older and newer Ultra models, since rollout of Roku 10.5.
For whatever it's worth, I now have 10.5 on all 3 of the devices listed in my signature below and have not experienced any growing pains with the new version. I don't know if it really matters but when I upgrade to a new major Roku version I always manually run an additional update check as soon as I receive the Roku update to make sure I have the latest versions of all my channel apps to prevent many update-related problems (Settings > System > System update > Check now).
And for good measure, I always do a System Restart after updating. Depending on your Roku model and Roku system version, you'll find the System restart option under either Settings > System > Power or Settings > System.
Roku Community Streaming Expert
I am not a Roku employee, only a user like you. Please, no support questions via private message -- post them publicly to the Community where others may benefit as well.
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Streaming Stick 4K+ 3821 | Streaming Stick+ 3810 | TCL Roku TV 43S245/C107X