The situation is like this if I find myself in a place where the network catches poorly, a loss of connection to zero strips is possible and "No service". But then it is not restored. After rebooting or resetting the network, the network works fine, until again you find yourself in a place where the network does not catch at all Only reboot helps. If you are in a place where the network is good you will not have this problem. Only where is a bad network and can disappear completely. But then the network will not be restored. The problem appeared after updating iOS 14.