Broken Subframe ?!? 93 90?

[randrews@post.cis.smu.edu (Robert Paul Andrews)]

I have been experiencing a rather annoying clunk in my front end since I have
had this car for about 6 months.  This last month, it has gotten worse.  
Finally went checkin it out and the subframe has a huge crack in the middle.
What is the deal?!  What in the world could cause this and why?  This car
has never been wrecked as far as I know BTW.  I want Audi to look at Monday
and pickup the tab for a new subframe on goodwill as my car has 73,000miles
on it.  Ideas?  Suggestions anyone?
Later!
Rob