SocketException - Could not resolve host

we are using Nakama with Unity and we have noticed some problems on our live production.
During player session we have randomly exception with sockets
java.lang.Exception - SocketException : Could not resolve host ‘
So player can play game for 30 minutes and more and then he gets this error.
In attachment you can find image from firebase crashlytics.
Does anyone have a clue how to solve it? Any help is appreciated.

We are using:
Unity 2020.3.48f1
Nakama Unity 3.12.0
Server Framework Runtime language TS/JS