Q7 distribution belt
 

I have my Audi Q7 serviced every time it reminds me that i need to service it. Yesterday i had for the first time in 30 years that i am driving the experience of an broken distribution and was without power steering on the motorway doing 140 KMH. Is this normal for an Q7 that the distribution belt brakes ? the car is 4 years old and has 170K KM on the clock