chedda

My 17 C63 coupe occasionally (once every couple hours of driving) kicks me out of manual mode into auto mode and upshifts multiple gears abruptly (similar to gear switching in comfort mode). I have to triple press the manual button to get back into manual or switch it to comfort then back into sport+ with manual mode. It happens randomly and not necessarily when I'm pushing it or not. I daily drive it in sport+ with manual mode about 80-90% of time and it has around 70k miles now. I can live with it as it only happens 2-3x a week, but I'm curious whether it's an easy fix or just live with it.

My car is perfectly warmed up with engine temp around 190-210 F (90C), and tranny temp 170-190 F (80C) when it does happen.
I took it to the dealership last week and got both an engine oil and transmission service. They told me the car is in excellent shape and that they've never heard of my issue before.

Any thoughts? Thanks.