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I have not had this happen to me but, I can tell you that the Onstar module will shut down after a few days of inactivity. That explains why you could not get the app to work. And if I remember correctly, making a change of the ERDTT setting also requires a restart before the setting is changed. You could have just popped the hood with the car on to see if the engine will start.
The other symptoms sound familiar and there may be a software update to address what you encountered, so a dealer visit is in order.
Is it possible that the Check Engine lamp was on when you parked it? Remote starts are disabled if there is a MIL.
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