So, I recall reading more than one thread mentioning that after several days of non-use, the Volt goes into some sort of sleep mode to save battery power. As part of this, the OnStar App can no longer communicate with the car. Is this a fact?? I parked my 2017 last Friday planning not to use it for a month. I ran the main battery down to 2bars. I did not plug in the charger. I did connect a trickle charger (Battery Tender Plus) to the 12 Volt battery. Here it is a week later and I still can use the OnStar App to check the Volt's status! Perhaps because the Volt knows the Tender is connected??? Just wondering....