Ignition switch 1995 A6Q

[Grant]

All,

My mom's 1995 A6Q has taken to eating ignition switches.  Either she' 
having a string of VERY bad luck, or somehow is causing the problem.  
let me explain.

Fall 2004, the switched stopped returning to the accessory position 
automatically, and was replaced. OK, its 8+ years old.

Winter 2005 it suddenly wont start. Cranks fine, but as it turns out, 
the fuel pump is not engaging and the switch "feels funny".  Replaced 
under warranty.  Problem gone.

Summer (early aug) 2005.  Same as Winter 2005, but more gradual. 
Sometimes it works OK, sometimes not. Then it progressively gets worse. 
  Replaced. 50/50 with shop.  Problem gone.

This week, guess what is starting to happen.  Switch feels looser than 
it should (movement).

So - any idea what might be the cause?  Bad luck?  Abusive parent?  
This is getting silly, not to mention expensive.  I think I'm 
dis-assembling this time.

Thanks in advance,

Grant