Hi @Markus_Menasci,
So we can better assist you, please provide a brief description of your current setup using this link as a guide.
Make sure to describe your network configuration/topology, including any networking hardware currently in use, so we can have a clear understanding of how your devices are communicating.
In the past we have seen Google DNS or Cloudflare DNS improve TIDAL behavior. If you give one of those a try is there any improvement?
Just to verify, Qobuz is working without issue, correct?