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I have three TP-Link routers. The WDR3600 I have is set up as the primary router with DHCP enabled. The other two routers I have are a WR841N and a WR740N. I have been able to successfully set up a wds bridge between each of the other two routers to the WDR3600 without an issue as long as I don't have them both connected to the primary router at the same time. If I try to have both of the routers connected to the primary router at the same time I get a slow degradation of down load speed from all three routers resulting in having to reboot the routers after a few hours. I want to know if there is a technical reason why I can't have two routers connected to the primary router through wds.

WDR3600 - primary router, IP of lan 192.168.1.1, DHCP enabled, ssid PooleNetwork, channel 6
WR740N - secondary router, IP of lan 192.168.1.2, DHCP disabled, ssid LolasRoomsWifi, channel 6
WR841N - secondary router, IP of lan 192.168.1.3, DHCP disabled, ssid PooleNetwork3, channel 6