Noisy Interior & Prone to Stalling

Bought LS460 AWD 2016 in 01/2017.
Present Mileage around 42K.
It became too noisy even to hear the radio.
Very disappointed.
Lexus checked without decibel measurement meter.
Very tricky & crooked mechanics.
For them it is normal.
The car started stalling while driving & I gave the benefit of doubt to Lexus. But the stalling was noticeable & pronounced when I was climbing a steep street in Capitol Heights MD & I had to press the accelerator with all my strength to crawl the climb. I thought the car could slide backwards causing major accident.
Very scary but Lexus sees no problem.
I will never take a legal U-turn in HWY in this car as I could easily become a sitting duck. Very unsafe car & stone deaf Lexus