I get this surging or loss of power at low speed on my 2018 Mazda CX-5. It was very noticable when I took it off the lot to go over a speed bump, I thought I had it in first gear, but it does seem to be getting better. Service dept said its just the transmission adjusting to a different driver, which I think is a bad excuse and I'm sure would not noticed if I brought it in to have it checked. Has anyone else experience this? I will be going in to update the software for the cylinder deactivation, but that should not affect this.