I am having the same problem on two devices. One has roku built into the smart TV the other is a roku device plugged into a TV. In both cases I have check that there are no system updates needed, i have done a network check and have removed quite a few channels from each device. I have powered off each device as well as the routers each is connected to. One is wireless the other is wired.
What is going on. Is roku getting hacked?