Hi, I have a similair problem..
strange thing is that it happend after I replaced the wifi-antenna. After assembling the MBA it started malfunctioning as described at the first post.
I took the MBA apart and connected part for part while testing it.
It only works normally when I do not connect the "I/O Board Cable".
When I connect the "I/O Board Cable" it starts malfunctioning again. So I tried with a working "I/O Board Cable" from another MBA and the problem starts all over again..
So could this also be a flash problem?
Or does anyone think it might be something else?