You can't reboot the router so it's time to use other connections till the admin is back.
Recently, I connected to a friend's network who is nextdoor and shares internet with me. I connect with my laptop, wirelessly. The network is protected with a password, which he gave me and I connected normally without any problems. After a few days of normal use, the network just disconnected and reconnected back. Sometimes it takes time to reconnect. This has been going for aroun 4-5 days and I don't know what to do, because my friend is missing too! Today, I tried removing the network from my router entries and tried reconnecting back but there was no use. What can I do?