One way or another, the mechanic is a goof. The new axles come with
fresh circlips and you have to confirm that they CLICK into place. If
not, it can come out and do a great deal of damage.
There are two other problems that I've seen cause the axle to fall out. The
first is an installation issue. Sometimes there is not enough air in the
inner CV boot to allow the joint move in and out as the suspension travels
up and down. If there's not enough air, the joint will essentially be
pulled out the transmission just enough to pop the circlip out of its
groove. The joint then eventually falls out of the transmission. The other
problem occurs if the car has been in an accident and the frame is no longer
straight. It doesn't take much to bend the frame enough to cause a
problem. I know of one car where the driver slid into a curb in a snowstorm
on an icy road. The axle would repeatedly fall out. I then measured the
suspension geometry and determined that the problem was that the frame was
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