My 98' Boxster (83,000 miles) did that a couple of times last summer and it threw a few check engine light codes at the same time. Turned out to be a couple of sensors in the pollution control system. Cost me about $600 and hasn't been a problem since. It was a strange feeling to be driving down the road as the dash warning lights all came on and the engine just went silent as I coasted to a stop.
I suggest you check to see if there are any stored codes with a code reader.
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