It is the plex app. Does the same thing on my fire stick. Pulling the stick out of the HDMI port and removing the power usually fixes it. On my other TVs I gave up on the streaming boxes, sticks, and bluray players with apps. I just use a small PC in a tiny case. A mac mini also works. There isn't a better media center solution out there IMO at least for my needs. What are my needs? One "box" to stream every video format off my server, read DVD/blurays, and netflix/hulu. If you have a better piece of technology I am all ears.