I think your right...

I've had a couple of devices running under the 5ghz connection and they seem solid, and the 2.5ghz fails on a regular basis, leaving the 5Ghz running... not really any good as a dual band router, since not all my devices have 5Ghz, as i found out ( the boys where not to happy when i disconnected the Itouchs )

so i think it's a return for me... not up to spec or faulty device..

Mike