Just quick thought. I often am faced with the WiFi Direct printer acting as an AP issue. When a customer has a WiFi issue I do a WiFi scan and a lot of the time its a printer broadcasting on the same channel as the R-Series router. Invariably the router and the printer sit right next to each other, yet neither of these devices change their channel. Perhaps the printer is just dump, but surely the R-Series router is capable of checking this at x interval and changing? A reboot results in channel scan, but thats not practical.