I need help when I am trying to play a game or watch tv someone at my house can just connect to my Tv and power it off or change the channel is there any way I can stop people from doing this
Somebody probably has the Roku app and is in close proximity.
They would also be logged into the same Router with the same password.
You can change this within your Router.
You can also try Settings/System/Advanced system settings/Device connect>>Disable