That may indicate the OVP pins were not making a good connection in their socket..common problem and one can usually tell by looking at the base of the OVP for discoloration on the pins and the base of OVP. Same goes for the fuse on top..

A crude but effective test is to tap the relay when the trouble arrises and see if one can see a difference in running, or if not starting, does a few taps get it to start..
If Yes..OVP replacement is usually the remedy...

Many Benz Techs carry a spare OVP in their toolbox to use as a diagnostic test tool b/c it is one of those faults that are easier to track down by popping in a Known Good part and see if that fixes the problem, vs chasing around for days with a Scope, etc.........
OVPs have such a reputation for faults that they get blamed for EVERYTHING, from causing Flat Tires to Streaked Windshields......

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A Dalton