Probleme Mit Talk

hi, I have a problem with Talk. I have now got a server like I said in an introduction. The problem is that there are 2 people in Talk via cam. The connection is being disconnected for everyone and reconnected. What could that be? can someone help me here?

test Talk Url: S4GS-2TB-Cloud-2TR

Talk Server Introduction: Nextcloud Talk auf vServer installieren -

Log docker