GL-AR750S-EXT Slate Iphone tethering issues

Hi, I just got my new ATX1800, and my current place does not have wifi, so Im connecting my iphone to the router via the tethering mode. However, Im having the same issue where every now and then, the router disconnects from the iphone.

I am trying to uninstall mwan3 (gl-sdk4-mwan3), but it keeps failing.

Sincerely a new user