My guess would be that it's a power issue. How are you powering the boards? Intel has stated that the current required when running WiFi can spike above the 500mA limit for USB. I haven't had any problems running off USB, but your USB controller may be tighter on the current limit and may be turning off power if it goes just a bit over 500mA. I would try powering off an external power adapter if possible, or at least try powering from another USB controller / hub.
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