I know what you are all going to say, slow down on humps etc but in fact I do. So long story short, driver side almost never goes wrong - and i am a heavy b@stard. NS always goes off every 1.5-2 years. I could hear the NS making a knocking noise when theres free play and i had in mind to replace it but I was told not yet for a weird reason. Fast forward a few months, both sides make a cringe noise after a few minutes of driving. had it checked out and I was told its the suspension arms, but its beyond me why this is a situation every two years