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It could be related to low voltage. If the vehicle system voltage drops too low, the ASR system could go into a limp-home mode.
Did they ever check any of the affected computers for trouble codes? Usually the system going into limp-home should trigger a trouble code of some sort.
One curious thing I can't quite resolve is why the car would restart after stalling if it's related to low voltage, but it's possible I'm sure. I certainly would pay to do a simple cell and load test of the battery and do a test of the alternator output. I would test it with a voltmeter on the car for about 1/2 hour to see if it drops suddenly at any time.
Gilly
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