ML320 Shutdown!

[lrn2ride]

Hi All,
I am at a loss here. I have a 99 ML320 that began to shut off randomnly without warning. The engine would shutoff while driving and I would lose most electrical components. When I would try to restart it would not crank, click or anything and then suddenly all dash lights would come on and it will start as though nothing happened. Also when it shuts off I have headlights,horn, radio, seats, lcd dash (odometer, temp, clock). No locks, mirrors, windows, warning lights, climate control, flashers, signals...Also no check engine light after restart. After the latest shutdown it has not reset itself and this time it seems for good. I have checked all the obvious (batt., cables, relays, fuses, second key,) Any suggestions would be appreciated.