Roku Streaming Stick+ keeps buffering YouTube Music when there's just a thumbnail, but YouTube Music with video is fine & 4K HDR is flawless. Video below is me testing with an older RokuHD under the same conditions. To be clear however, the Roku4K struggles under all conditions eg. different router, TV, time of day or even just the Roku4K on the network. I mention the YouTube app damaging OLED TV's but that's on another thread. I now use a second screen to play a video then get no damaging logo. I'm now in the crazy situation of using the RokuHD on the 4K TV as Roku is only used for music now, so don't have to have the TV on & it be damaged by the app. By using a HDMI audio splitter to amp. The Roku4K is now next to the router on a HD TV in another room & still can't play YouTube Music.