Maybe check the various system logs (journalctl, files like /var/log/syslog, …), to see if there are some error when the problem occurs.
It is difficult for us to have an idea, as we don’t know what is installed on your server.
Theres no error in logs.
There is only UFW and teamspeak installed in the server.
Nothing else.
Its pure debian 12.
I guess I will give up. Sorry for wasting your time.