In current wpa_supplicant, the systemd service (wpa_supplicant.service) is restarted every time the RPM package is updated, because of the following lines in the specfile: %postun %systemd_postun_with_restart wpa_supplicant.service This generates a temporary disconnection during the package upgrade; such disconnection is (almost) immediately recovered when the interface is managed by an external daemon, like NetworkManager or systemd-networkd. On the other hand, there are situations where the connectivity is not repaired after RPM upgrade until manual intervention. Similar problems have been fixed on other packages by simply removing the 'systemctl try-restart' command from the specfile in the %postun target.
wpa_supplicant-2.6-13.fc27 has been submitted as an update to Fedora 27. https://bodhi.fedoraproject.org/updates/FEDORA-2018-b724c4abd7
wpa_supplicant-2.6-13.fc27 has been pushed to the Fedora 27 testing repository. If problems still persist, please make note of it in this bug report. See https://fedoraproject.org/wiki/QA:Updates_Testing for instructions on how to install test updates. You can provide feedback for this update here: https://bodhi.fedoraproject.org/updates/FEDORA-2018-b724c4abd7
wpa_supplicant-2.6-13.fc27 has been pushed to the Fedora 27 stable repository. If problems still persist, please make note of it in this bug report.