Mid 2013 Haswell Macbook Air Wifi problem: software or hardware?

I have the 11" Macbook Air (mid-June 2013, Haswell) and it has problems connecting to wifi. It reluctantly connects after searching for the network for a few minutes, but then it stays connected.
My question is: can anyone tell me if this is a hardware issue (in which case return/repair is necessary) or a software issue? If it can be fixed by an update, I don't mind waiting, but I don't want to waste my time if the machine is physically defective.

There is an update available now.
http://support.apple.com/kb/DL1672
A new Mac comes with 90 days of free tech support from AppleCare from the date of purchase.
AppleCare: 1-800-275-2273
Call AppleCare.
Best.

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