With the proliferation of do everything hubs and wifi extenders it’s becoming increasingly difficult to make sure that everything keeps working that wants a chunk of the 2.4ghz band. It is quite possible now to have several wifi channels in use and a ZigBee device like the Phillips Hue bridge and then some xbee radios and then add another hub like the new quirky devices or something and to start having significant problems keeping everything working.
Some things to keep in mind:
As of build 878 you can create a unit on your Phillips Hue bridge interface with an address of “zigbeeaddress” which will be set to the current running channel of it’s network. This is a read only unit, changes must be made from inside the Hue configuration utility or web page, but it will let you know what it’s doing and if it changed on you.