Wiring problems of the 2000 Land Rover Discovery Ii

The "spiral cassette" on my 2000 Land Rover discovery has failed three times (about every 30,000 miles or two years). When this happens, the srs light comes on and I have been told that my airbag srs is not functional. I have had it replaced and not "tested" the air bag. It has now failed again. This seems to be a defective design or consistently defective manufacturing which leads to failure of a vital safety system. I would like you to investigate to determine the extent of this problem and whether or not a recall is necessary. I believe the part is "yrc100350 rotary cassette".