My car is an '87 300D Euro 4matic. Problem is my turn signal lever (combination switch) sometimes doesn't release or return to neutral after making a turn.

Also, it seems that I need to oversteer to the left after making a turn in order to get the turn signal lever to release.

I've had my combination switch replaced, checked the steering box's pitmas shaft center position, and had the wheels aligned, but the problem persists.

What could possibly be wrong here? Thanks a lot.