My Turris Omnia also rebooted immediately after update even though there are 7 days restart delay set.
Additionally following error showed:
Updater failed:
runtime: [string “requests”]:430: [string “utils”]:422: Unable to finish URI (https://repo.turris.cz/hbs/omnia/lists/pkglists/openvpn.lua): Download failed: Couldn’t resolve host ‘repo.turris.cz’