Well, it sounds to me like a faulty fuel pump relay, but then I would say that because exactly this has happened to me (didn't necessarily always restart though), and the relay was the problem.

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190E's:
2.5-16v 1990 90,000m Astral Silver
2.0E 8v 1986 107,000m Black 2nd owner
http://www.maylane.demon.co.uk/190esmall.jpghttp://www.maylane.demon.co.uk/190esmall2.jpg