What happend to my speaker?

I noticed after going down a dirt road my right front speaker was making a noise.  I assumed I jarred something loose and it was just something viberating in the door panel.  I took the door panel off and found that one of the wires had pulled out of the connector and was touching, but not well connected.  I thought I could simply re-connect the wire and fix my problem....... not so.

I took the speaker out of the door, held it in my and and it's clearly static.  I looked closer at the tweeter and it's got a crack right down the middle.    Could this be caused by the loose connection or the dirt road?  Or is it a factory defect?  The speakers are Blaupunkt PCxT462 (2-way transparent 4x6's).  I bought Blaupunkt's all the way around and I've only had them since the end of January.  If this starts happening with my 6x9's I will not be happy. 

Anyone know what might cause this?  Is it worth trying to get a replacement under warranty or just buy a new set?

Interesting info guys.  I don't know much about speakers, but I'm pretty sure this isn't right.  Here's a picture, you can see the crack right down the middle.

Nah, I didn't have the problem until just a week or so ago *right* after going down the dirt road and it's been 95+ degrees here so it couldn't have been freezing.  I already ordered some replacement Blaupunkt's (not transparent) and I'm going to call them when I get time to see about warranty replacement.  They are stamped July 02, so they may not be under warranty.  I was aware they were closeouts when I bought them and the price reflected that. 

Thanks for the info guys. :)