I'm having exactly the same problem with a Fujitsu Lifebook UH572 with this chipset. It generally behaves itself with in our offices where we use some Zyxel WAPs (though it has difficulty connecting some times), it connected to my LG Nexus 4 acting as a wifi hotspot, but the user had problems at home and in our Italian and South African offices (I don't know the hardware).
Essentially, it would connect and stay connected then disconnect after 5-10 minutes. At his home, it also managed to crash his wifi router. I've updated the drivers, played around with settings and got nowhere. Eventually I disabled it and installed an Edimax USB wifi card which has been rock solid. Intel, you have a problem.