2018 Premier here. I would say it either has the dongle installed near hood latch to disable s/s or the battery may be nearing time for replacement. My car stopped doing s/s for months then battery died and when replace s/s was back. I think I read car checks the condition of battery on...
Could be many things; starter, relay, etc. I don't want my car stopping at intersections just so car companies can meet some government number for mpg. $20 to Amazon for the device to disable start stop is the best money I ever spent on my 2018 Equinox.
Mine did that for several months then one morning it wouldn't start. Needed a new battery and then the auto-stop was back. I think if the battery is not perfect it doesn't do auto-stop.
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