TeamSpeak server - power failure

Hello!
I host TeamSpeak server and last year happened that electricity crashed 2 times. Server reboots immediately when power comes back, but router needs 2-3 minutes to get Internet connection.

Is there any known issue that if TeamSpeak server can’t reach or verify license that it crashes after 2-3 hrs? It happened to me a few times. When there is internet connection and I run server, there are no issues at all.

Thank you.