2011 MBP Airport Problems

Okay, so i've had problems with airport on my 2011 MBP since they gave me this one as a replacement for another laptop that was faulty (different reason).
This one, works on wifi, then it drops, then it comes back again. I've spoken to applecare who have said there 'appears to be a problem' and requested me to format the harddrive to see if i could replicate the problem on a clean harddrive with no software updates.
The problem is still occuring, if i ping my router when the airport seems to stop (full wifi signal) i obtain a 100% packet loss (everything else that is on Wifi is working when this occurs on the MBP). Now I'm getting a combination of this and airport disabling itself, if I click on the wifi network, it asks me to put in my password but does not allow me to select ok. The only way around this is then to proceed to turn airport off and turn it back on.
Does this sound like a hardware fault? and has anyone else experienced anything similar?

Well, some of it is fixed. My wife's MacBookAir still knocks me off of the network. ...H

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