1993 300E with the m104 engine.

Sporadically the engine just wont start. Usually happens after making a short trip down the road then trying to restart minutes later. Can try and crank the vehicle for 5 minutes. Usually have to let the vehicle sit for 5 minutes then it will start.

The vehicle never starts while trying to continually crank it. When it does start it is as if it is starting normal, turn the key and it starts. Any ideas what to check?

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2001 Mercedes-Benz C320 3.2
1991 Mercedes-Benz 300E 3.0