I am facing the same issue as well on my XS Max and it is frustrating to have to restart the phone all the time whenever my network goes. Nowadays I’m restarting my phone between 5-10 times a day. I tried waiting for 10 mins for the network to come back up but nothing happened so I had to restart my phone. It seems that is the only way to recover the network other ways like airplane mode or reseting the settings has no effect. Please fix this bug on your next update and hoping the next update will be soon.