I have had a RWD M3 since Feb 2018. I absolutely love the car. But, over the past 5 months or so, I have noticed an intermittent lag in acceleration when taking off from traffic lights. It was definitely not there for the first 6 months or so.
Basically, when pushing the accelerator (from a stop) fairly aggressively, the car will just roll at about 5 mph for 1-2 seconds before applying the requested power and then accelerating quickly. It does feel artificial, as if the car is limiting the power for some reason. But, then at the next stop, it might accelerate immediately as expected, with no lag. The difference is very noticeable, especially when used to the immediate response. There doesn't seem to be any pattern to it, as far as temperature, start of drive, etc.
I admit that I like spirited driving and love to take advantage of the M3 quick acceleration. What concerns me is the problem is very intermittent. I may notice it just a couple times per day. I don' have "chill" mode enabled or anything like that.
I have had service look into it. But, they were not able to reproduce the issue, and had never seen this issue before. I will probably make another appointment as I have seen it more often in the past week. I suspect it might be a bad sensor of some sort that limits the power (i.e. traction control).
Has anyone else encountered this issue before?