I used to be able to see all the clients connected to my C9 using the tether app, but although 20 are connected now none of them show? If I reboot, sometimes I can see them for a few minutes but then

Hi, My Archer C9 v 5.1 doesn't show any wifi/wired clients in the iPhone app unless I do a reboot. After I logout from the app then they disappear again and a new reboot is necessary. All clients have