It sounds like you are experiencing an issue with the YouTube TV app on your Roku device where the app is not correctly resuming playback after the screensaver has been activated. This can be frustrating, and it is possible that the issue may be related to a problem with the app itself or with your device. Here are a few things you can try to troubleshoot the issue:
Check for updates. Go to the "Settings" menu on your Roku and select "System update" to see if there are any updates available for your device. If there are updates available, install them and try using the YouTube TV app again. You may also want to check for updates to the YouTube TV app itself by going to the "My channels" menu on your Roku and selecting the app.
Restart your device and router. Sometimes, restarting your devices can help resolve connectivity or performance issues.
Uninstall and reinstall the YouTube TV app. To do this, go to the "My channels" menu on your Roku and select the YouTube TV app. From there, you should be able to select "Remove channel" and then install the app again from the Roku Channel Store.
If you are still having difficulty, you may want to contact YouTube TV customer support or Roku customer support for further assistance. They may be able to provide additional troubleshooting steps or help you determine if there is a problem with the app or your device.