Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
Apple Issue New SSD Firmware Update For MacBook Air
Apple have launched a rare fix for some of their SSD that is supposed to fix data loss, however if it fails, they will replace the drives for free.
The firmware update was released by apple the other day to combat a data loss issue within the hardware itself after users reported data loss from a small handful of the mid-2012 MacBook Air range.
The update is available from via software update on your device and is highly recommended even if your system is not showing any signs of data loss.
Once the update begins it will scan any effected hardware and apply the fix, however if the SSD is working correctly, the update will terminate and no future update will be necessary.
If the updater cannot update your drive, then on its update page Apple claims you can make an appointment to have the SSD replaced, free of charge.
The firmware update is a small 2.21MB download, and requires OS X 10.7.5 or OS X 10.8.3 or later to install
Please remember that it is very important to backup your system before carrying out any potential upgrades and it is also recommended that you plug your device into a mains power socket as some updates take a while with several restarts needed.
Apple devices will usually update on battery power above 50%.
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