Apple has recently released two SMC firmware updates for MacBook Airs. The first is for mid-2013 MacBook Air models, which fixes faster than expected battery draining when the display/lid is closed. The second is for early-2014 MacBook Air models, which improves the reliability of waking from sleep when external devices are connected, fixes random reboots, and addresses a problem where the built-in display would not sleep when using Boot Camp and an external monitor.