problem with network manager

[Oleg Eastern <olegdab gmail com>]

Hello. My name is Oleg.

I recently started using ubuntu 18.04 and a problem arose with the
network manager. My mobile 3G operator cuts off the connection every
hour and the network manager can not see it and reconnect.

How can I get him to restore a connection when a connection is lost?

Ubuntu is clean, no additional applications have been installed

thanks for the help