@radicaldoc 

Good day.

Thank you very much for your kind reply.

Have you tried the beta firmware which could help us fix the network band?

 And please also help us check the following information:

1. Before and after the LTE connection disconnected, could you please check whether the network band under advanced>status changed or not?
2. When the internet disconnected, is there any error message under basic>network map, such as unknown failure: please make sure the internet configuration is correct;
3. How did you recover the connection, atomically coming back, or rebooting the router?

Thanks a lot.