jellyfin freezes on TV every 2 minutes

Hi, as the title says, when streaming to the jellyfin app an a fire TV, the video freezes every two minutes. This happens when direct streaming, so it shouldn’t be a transcoding issue. Useing the website it works just fine. Any idea how I can find out what this is?

Edit: I just noticed, when forcing transcoding by limiting the quality (Bitrate) on the client to lower values, it does not freeze…