XFINITY STREAM APP video Freezes on Cube Tv

My Xfinity stream app video freezes intermittently but audio is fine when stream live content using my Amazon Fire Cube Gen 3 TV on my LG C2 TV. I have uninstalled the app several times, upgrade all firmware, replaced HDMI cables, tried all TV HDMI ports but it still does it. My ROKU stick does not do this.

Is the Amazon Fire Cube TV Gen 3 not compatible with the XFINITY STREAM APP?