Automatic Transmission problems of the 2003 BMW 3 Series

I was the previous owner of a BMW 325i that I have been told needs a new transmission. Age - 2003, miles 60,000. It's unacceptable that a car with so low miles, has been maintained and driven gently has experienced this problem. After searching on the web, I find that this is a recurring problem with BMW's. Why has nothing been done? how can BMW say this is not their issue when clearly this is a problem with their cars. I'm spending an additional 6,000 on this car. I recently purchased a brand new BMW and sold the 325 to a close friend. I replaced the transmission as I could not expect them to pay for it. Prior to the sale, the car checked out with BMW. Little did I know 2 wks later it would have this problem which appears to be a standard problem with BMW. I regret that I bought a new one.