In some cases, removing the channel and then re-installing it may help. To ensure the process is successful, follow the steps below making sure you restart your Roku device before adding the channel again.
-Remove the channel: Highlight the channel tile on your home screen and press the Star button to open the options menu. Select Remove channel and confirm. -Restart your Roku device: Restart the device from the settings menu. Go to Settings > System > System restart > Restart. -Re-install the channel: After your Roku device restarts, visit the Roku Channel Store and add the channel again.
I'm having the same issue with most live tv channels on roku not playing and none of the movies playing at all. I've tried everything you listed including removing roku channel then system reboot and reinstalled roku and it made no difference. My internet speed says excellent at 25 mbps and I have the latest available software. If it's a roku problem that's been going on for over 2 weeks then please advise when it might be fixed