In order for Roon’s @support team to 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 they can have a clear understanding of how your devices are communicating.
Are you using the latest version of QNAP? There have been some changes that might help with this, but it is still going through the QNAP App Store cycle, you can install a manual copy in the meantime though, see:
That is for QNAP system version, but the Roon app can still be out of date.
You can safely click on Unauthorize and re-authorize the Core if needed. That message is just saying you can only have one “active” Core at a time.
Ok it seems to have fixed that problem but caused another:
when i click on an artist name, album, overview or whatever else i get the wobbly jellyfish appear, sometimes for over a minute.
Can you please reproduce the issue, note the exact local time + date of the failure and send me a copy of your Roon QNAP logs by using these instructions?