the same thing happens to me, it moves out of the white teflon part of the extruder and once in a while it pops out completely.
I will give the following a try:
http://www.thingiverse.com/thing:11864
I haven't yet tested this one personally but it's very similar to what I would have done.
Another thing to keep in mind is that the extruder tube is forced in different direction and it has a tendency to wiggle it self out, especially when printing with retraction.
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msurunner 2
Double check your clamp fitting is installed correctly on the printhead with a horseshoe clamp to ensure a good "bite"
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