MAJOR Airbag Problem... what should I do?

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Hey guys... I've been having problems with my airbag light coming on. I have taken the X in about 4 times now for the same problem. The dealer says that it showing a fault in my rear side airbag and it's been the same problem/fault every time. They have done everything from replacing the airbag, to the airbag module, cable harness, sensor, etc. But every time I get the car back, about a month after they "fix" the problem, the light comes back on. The last time, it was in the shop for a week because they called in some special tech from BMW NA. I was hoping it was finally fixed, but monday night the light came on again!
This will now be the 5th time I will be taking it in for the same thing. I'm really getting frustrated with taking the car in and having to waste time out of my day doing so.
What do you guys recommend I do?
Thanks.