When my TCL/Roku tv is off and is turned back on, and I try to access an app (YouTube tv, Netflix, Hulu etc) I will get an error message “internet connection error” or there will the app won’t start. In order to fix it, I have to go to the roku home, check internet connection then it will start working again. I have an orbi router/satellite nearby so it not the router. I have other roku/tcl TVs without any issues. I have also changed the 2.4ghz channel on the router which has helped some. I’ve done master resets on the tv and internet connection but continue to have this problem sporadically.
I fixed this by connecting an Ethernet cable directly to my router, setting up wired network and then switching back to my WiFi network.
So just to clear, you would wire connect your roku tv to the router, set up a connection, then unconnected then reconnect the tv with a WiFi connection?