Model: 318i YOM: 2017 Trim: Luxury The gearbox is very jerky/shudders at low speeds in Comfort mode, particularly around 80km/h at 1,500 rpm. Very troubling feeling from such a premium product! Problem goes away if gearbox is put into Sports gearbox (S) mode, or the car is put into Sport mode. SC says gearbox is "maintenance free" -- I call horse crap. Looking around the internet, it either needs to have the ATF flushed and replace, or it's a mechanical torque converter issue. Anyone had the same issue, and what was the solution?