My advice is keep an eye on them,
IMO it's over tightening that kills them, we had someones in the other day where the wheel nuts were ridiculously tight - We used the breaker bar to loosen them and the threads literally fell out of them once off,
Over use of air guns could well be a cause.
If your concerned it maybe worth just going round the car to see if you can undo all the nuts - if you do them one at a time, off then back on with a torque wrench you don't even need to jack the car up.
At least you will know that if you get a puncture you can change the wheel
@ DoogyRev - You know you can borrow mine anytime your passing