Iptv: one channel is stuttering, all others work / stream stalled in log

i sometimes watch a channel called ORF1 - good movies and no ads.
my provider (init7) has a iptv stream and it worked like a charm. about 2 or 3 weeks ago, i noticed that on ORF1 the screen is stuttering, sound is hanging and then the complete playback stops after about 30 seconds. it is only on ORF1, all other channels work like a charm.
i checked with VLC on my machine and ORF1 runs fine, so it is some kind of problem on coreelec but i dont know what it is.
anyone an idea?

2020-02-16 22:23:08.082 T:4065317456  NOTICE: VideoPlayer::OpenFile: pvr://channels/tv/All channels/pvr.iptvsimple_1535381756.pvr
2020-02-16 22:23:08.084 T:3431986048  NOTICE: Creating InputStream
2020-02-16 22:23:08.084 T:3431986048  NOTICE: Creating Demuxer
2020-02-16 22:23:16.589 T:3431986048  NOTICE: Opening stream: 0 source: 256
2020-02-16 22:23:16.589 T:3431986048  NOTICE: CVideoPlayerVideo::OpenStream - Creating codec: 27
2020-02-16 22:23:16.591 T:3431986048  NOTICE: Creating video thread
2020-02-16 22:23:16.591 T:3431986048  NOTICE: Opening stream: 1 source: 256
2020-02-16 22:23:16.592 T:3431986048  NOTICE: Finding audio codec for: 86019
2020-02-16 22:23:16.592 T:3431986048  NOTICE: Creating audio thread
2020-02-16 22:23:16.592 T:3431986048  NOTICE: Opening stream: 3 source: 256
2020-02-16 22:23:16.592 T:3431986048  NOTICE: waiting for teletext data thread to exit
2020-02-16 22:23:16.594 T:3431986048  NOTICE: Creating teletext data thread
2020-02-16 22:23:16.598 T:3406807936  NOTICE: running thread: CVideoPlayerAudio::Process()
2020-02-16 22:23:16.598 T:3406807936  NOTICE: Creating audio stream (codec id: 86019, channels: 6, sample rate: 48000, pass-through)
2020-02-16 22:23:16.598 T:3319128960  NOTICE: running thread: CDVDTeletextData
2020-02-16 22:23:16.605 T:3415200640  NOTICE: running thread: video_thread
2020-02-16 22:23:16.674 T:4065317456  NOTICE: Whitelist search for: width: 1280, height: 720, fps: 50.000, 3D: false
2020-02-16 22:23:16.675 T:4065317456  NOTICE: Display resolution ADJUST : 3840x2160 @ 50.00 - Full Screen (40) (weight: 0.025)
2020-02-16 22:23:16.912 T:4065317456  NOTICE: VideoPlayer: OnLostDisplay received
2020-02-16 22:23:16.913 T:4065317456   ERROR: GetString: error reading /sys/class/amhdmitx/amhdmitx0/custom_mode
2020-02-16 22:23:17.137 T:4065317456  NOTICE: VideoPlayer: OnResetDisplay received
2020-02-16 22:23:26.998 T:3406807936  NOTICE: CVideoPlayerAudio::Process - stream stalled

You could try latest nightly build if it solves your channel issue

this is on latest nightly