Do you have any other Apple device using Key Chain? Because if you Forget the guest network on one device, it'll forget it on all. Then once you see another device not connecting to the guest, you'll mistakenly add it and it'll add the guest network for all other devices.

Aren't there routers out there that will allow you to program it to allow certain devices that is attached to the guest network, full access? As if it's connected to the normal network. Just a simple programming of the MAC addresss to allow full access.

KOT