Might be Auto Start / Stop. When it switches over the car idles on electric and when accelerating the gas engine restarts. Sometimes bit jerky.Has anyone experience this issue? I have a 2015.5 S60 T5, when accelerating, I get this ticking/clicking noise for about a second or so. And it feels like its losing power. Usually occurs between 3k to 4K rpm. I feel like I don't get that quick torch. Any idea?