Multiple CV Boot Failures (same boot twice in 10k miles???)

[gse36]

Before I change it again, just wanted any input as to why my front right (passenger) outer CV boot is always failing!

X5 is 2003 model.

Replaced Jan 2008 @ 65k mi. (first time) - then replaced (indy 1)
Replaced Dec 2008 @ 68k mi - then replaced (diff indy - indy 2)
I don't know when it failed again, but we're at Feb 2011 @ 75k mi, and its showing a small leak again.

Driver side has been replaced Sept 2007 @ 58k mi (first time). Still seems to be going.

Does anybody have a reasonable explanation for this? The driver side is perfectly fine.

Thanks