I am experiencing the same issue. The only channels that seem to connect and function properly are Netflix, PBS Kids, Showtime, and YouTube.
The TV experiencing the issue is:
Roku TV 7104X,
TCL Model 49S405
Serial # YN001E532205
Device ID 9S6001532205
Software Version 10.5.0
The issue began after the most recent update, and I have tried every troubleshooting method I could find (to include restoring the TV to factory default settings).
Disney +, Hulu, Peacock, Prime Video, Vudu, and even the Roku Channel are all giving me error messages about network connection trouble or failure in some form or another.
We have another TV running Roku (Phillips) that seems unaffected, despite the fact that it also updated to 10.5.0
I can include details on that one as well if it would be helpful.