Power Steering Fluid problems of the 2009 Cadillac DTS

My 2009 Cadillac Dts recently had a problem with the steering, it was steering hard when making right or left turns and eventually began making noises. I took it to my gm dealer and they checked the hoses and fluid receptacle. All they found was the receptacle was low on power steering fluid and I picked up a bottle at an auto parts store and then my steering was ok. Several weeks later my steering got very hard and I had trouble steering it so I stopped and added more fluid. I returned to the dealer and was told my power steering line was leaking at one end where it was attached to some metal. My cost was $402 to replace the one hose. This leaky hose made my car very hard to steer and I can't imagine why a strong hose like this one would ever leak especially on a vehicle with below average annual mileages. The incident occurred around 61,700 miles and could have caused a bad accident.