I have a very weird problem with our router.
I have one server, that is directly connected to the router via Ethernet and runs a program, that I can access from inside of the local network. Normally it should not be dependant of our internet connection, however if our internet is slow, also the local network is slow. And if our internet is gone (since we didn´t manage to pay the bill) the Local Network also stops working.
Our router is a TP-Link Wireless N4G LTE Router Model No. TL-MR6400 with LTE network. It contains a SIM-card that connects us