I bought and set up 3 decos today. 
 

the main one is hard wired to my switch 

A second is backbones wired to my switch 

a third is WiFi connected to the main one. 
 

the decos are set up in AP mode as my broadband router is my dhcp. 
 

on the main and third deco , both internet browsing and apps on my phone can connect and work. 
 

on the second backbone wired deco, my iPhone can browse the web using safari and google search app, but all other apps such as blink or Facebook do not work. I just get spinning icons and no data. 
 

does anyone have any idea how to fix this? 
 

thanks.