The computer is about 15’ from the router.
Look up how to change the channel on your router. It works. People around you buy a new router and use the default channel. A couple of users on the same channel should be OK but when more people join the club connections become sporadic.
So get away from the default channel and the couple of other channels they recommend because other router owners might go to those too. I had this problem years ago. Switched to the alternate channels and it worked for a while but then the connection problem came back. I just picked a channel not on the list and have had no connection problems at all for years.