Wifi doesn't work when bluetooth headset connected?

I'm having a problem when on a call using my Jawbone 2 headset and trying to use the wifi. The wifi doesn't work when on a phone call using this specific bluetooth headset.

I'm able to reproduce this problem as follows:
1) Turn off 3G
2) Connect to a wifi network
3) Connect to a bluetooth headset (Jawbone 2 is what I'm using)
4) Call someone.
5) When on the call try to open any web page. It will say a connection doesn't exist. It seems the wifi signal goes to nil if the Bluetooth headset is connected. Not sure why this is occuring.

Any information regarding this problem is much appreciated.