The K40 module in your car is related to (descended from?) the OVP relay in the 124 and similar models. It's possible that it might cause a failure of the kind you describe. (K40 failure is usually associated with an engine that stalls because the IP is powered through K40.) My '96 E300 has not experienced your problem and I don't know what else to suggest. The price of a new K40 is about $100.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970