It works fine here on the Roku TV listed in my signature.
I guess the first thing I would try would be to change the setting to a different input, restart the tv to see if that "took", then reset back to my desired input and restart again.
To restart: From the home screen.. Settings.. System.. Power .. Restart system.
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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X