This interface is used when your device can't connect with STS servers: For updates, maintenance, errors, unavailable internet connections and more.
Ex:
Some schools don't allow game connections. When trying to play AL in those schools, the school's security system will block AL, and it will show you this interface.
The connection might either be really bad, or blocked by something else. Since you're using mobile internet, you should expect a bad connection. STS is not behind this.
Thoughts: I think that bad connection causes a bad synchro between you and the other players, increasing ping for everyone. In order to prevent such ping increase, the servers will not allow bad connections, ,but I am not sure about this mechanism.
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