@Ti301347-
Please share the model names and model numbers of the two Rokus with the problem, and the two without the problem. You can find this info on each via Settings/System/About.
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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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Ultra 4800 | Streaming Stick 4K+ 3821 | TCL Roku TV 43S245/C107X