You could check the fuses. MB fuses/ notoriously corrode at the terminals (on the fuse or the fusebox connections). I didn't believe it either, and my fuses all looked fine, but ancillaries like wipers started randomly stopping and starting, and this was the problem.
Cleaning the connections is a good way to reduce any future worries.
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black