I have had a problem in the past couple of months regarding my transmission shifting by itself into manual mode, and staying there, without being able to be switched back, and then later returning to Auto. Finally, after getting annoyed to the point of no return, I swapped the Trans switch (next to gearbox shifter) with the sunroof switch, and problem solved! I was able to switch back and forth from Auto to Manual, without a problem... Now I need to pick up a new trans switch.