It might very well be the switch in the stalk. On my 300D my headlights will sometimes go out completely and I have to wiggle the stalk to make them come on again. The headlights and fogs turn off as you’re pulling the switch towards you to turn the brights on, and that’s where your problem might be.

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)