I am unable to cast YouTube videos to my roku 3. It seems like my roku becomes undiscovwrable on the network after a time. this can be anywhere from a few minutes to a few days. Sometimes resetting helps, but it will still disappear from the list of devices i can cast to from the YouTube phone app. I can still cast to other devices on the network with my phone, and i can still stream on the roku, so my phone and roku must still be on the same network. This has happened in the past when live tech support was available, and the fix started with going to a secret menu. I can't remember the process or how to even get to the menu.