I've noticed that unless you use the Torguard apps for wireguard all the wireguard conf files downloaded from the TG config generator and configured manually on a router or the Wireguard app (https://www.wireguard.com/install/) can only login once and will expire requiring a new conf file generated. So, if you disconect wireguard connection for more than 15 minutes you must download a new conf file and set it up again.  Torguard explained to me that this permanent burden is for preventing m