Thanks for the post regarding the playback issue that you are experiencing.
Try removing the channel from the Roku home screen by navigating to the channel tile, pressing the * key on your remote, and choosing 'Remove channel'. Then restart your device from Settings>System>System restart. Once your player starts up again, add the channel back once more.
We would recommend trying to see if that resolves your issue. Please keep us posted.
This seems like it may be possibly buffering issue. Are you only experiencing this issue on Netflix or other channels as well? Have you tried rebooting your wireless network to see if that resolves the issue you are experiencing?
Having the same issue on one channel "Tubi" One movie no volume, the other lost video but kept sound. Tried the unplugging and no joy. Also I have tried going on other apps and there is buffering and the screen freezes.