Live TV Playback problems on Shield

Hello all,

I want to use my new Shield as my main device. Looks good so far, but Live TV has issues with TVHeadend:

When I switch from a 720p to 1080i channel the video plays strange: a bit slower, then faster, then slower again and so on. When I press stop and start the 1080i channel again, it works flawlessly. On SPMC this problem does not occour, I think I made the same configurations on both apps.

Maybe somebody sees in the logfile why this happens?

Log: https://pastebin.com/cTmDbA3M

Regards
zeebee