I do not need a solution (just sharing information)
Apple just released "MacBook Air Flash Storage Firmware Update 1.0"
for the Mid 2012 Macbook Air models it is currently being validated if this Fix from apple is maybe adressing
the following Issue:
http://www.symantec.com/docs/TECH206300
For the time being with the Knowledge of this particular Issue it can't be guaranteed that this is working.
So please be aware and we will update the KB & the Forum Posts as needed