My ZTE USB modem disconnects after a certain period of time and when I reconnect it connects well but doesn't give internet access. I started noticing this after a certain update Ubuntu asked me to install, which I did, without seeing any errors.
The only way for me to regain internet access is to restart/reboot Ubuntu and then connect again to the Internet.
It works that way but the process is tedious and most of the time I'm in the middle of some work and when I lose connection I always have to restart my computer. I'm using Ubuntu 16.04 LTS. Is there a fix for this?