NOT KNOWN DETAILS ABOUT GEARBOX CVT PROTON

Q. If the automobile comes to a stop (in the course of the decelerate/deceleration), i can listen to an incredibly obvious humming audio. If i switch to neutral, this sounds will disappear quickly. The sound is usually noticeable once the car is downhill with motor braking.Q. Is there anyway to stop CVT failure like honda city/jazz? Any Unique matt