I'm using a dual band set up at work with 2.4GHz and 5.2GHz 802.11n/g/a/b. Its a cisco corporate set up.

I can remain connected to the wifi all day (it picks 5GHz automatically, not sure how to force it to 2.4 at the moment) However, if I use bluetooth it will report the dysfunctional ap error and stop talking to the network ( I can't ping out and I assume that nothing can reach my N9 either.. but I can't prove this)

I've turned on my bluetooth headphones and less than 10 minutes later its fallen off the network..

This is repeatable consistently at work on 5GHz... Bluetooth + 5GHz seems to wreck the wlan connection..

I'm going to try and find out if I can connect to 2.4GHz and reproduce (it would be on the same AP equipment here)

I will also try at home where I have a Linksys E4200 (2.4/5GHz 11abgn) and a Billion 7800n (2.4 bgn)

tl;dr I can connect 802.11n on 5GHz, but if I use bluetooth the wlan connection fails