2015 BMW 335I Steering Problems

I recently was advised by BMW that my valve cover had a leak as well as a rear axle. I feel that after only 8 years and less than 80,000 miles those component should NOT be failing so soon. My biggest complaint is that I recently had my power steering system completely fail on me. I was able to limp my car home and turn it off to let it sit for 15 minutes which the dealer recommended. I started the car back up and it has been working fine. The dealer inspected the vehicle and advised that I should have the entire system replaced for a little under $6,000. My largest concern is that the steering system is going to give out when my wife is driving the car or when we are hundreds of miles away from a dealer to fix it. The aggravating portion of this is...

My car randomly stiffens steering in a turn which made me nearly hit a parked car and lit up a warning light stating “Drive Moderately”. The car recently also began to have symptoms of clunking and grinding when turning the wheel at low speeds. While this issue has recently arrises, my forward collision warning, blind spot detection, and lane departure warning safety features turned off completely i'm assuming as a result of the issue. The car also clunks and makes the same noise when turning the wheel side to side if the car is completely shut off as well. I’ve been referenced to SIB 01 26 18 and contacted both a BMW Service Center & BMW NA. Both tell me my car suffers from no symptoms, issues, and/or recalls; I tried to argue the fact that it clearly states that the page was more of a reference for models instead...