Possibly the "new" AMM was better able to cope with a failing Oxygen Sensor, which has gotten beyond coping with? Do you know how many miles are in the sensor?

On 2nd thought, I doubt a bad sensor would cause a complete shut down.
But I had that same symptom once, which would go away after reseating the AMM connector. Only happened a couple of times after the 1st event.
--
Bruce Young,
'93 940-NA (current)
'80 GLE V8 (Sold 5/03)
'83 Turbo 245
'76 244 (lasted only 255,000 miles)
73 142 (98K)
'71 144 (track modified--crusher bound)
New 144 from '67 to '78
Used '62 122 from '63 to '67