I frequently have this issue, this morning for example, freezing outside so asked the car to warm up ahead of me leaving the house and unable to wake up, so went out to the car, started it , error stated 12v restricted, so started the car, ran it a few minutes, error went off, then locked the car and app was able to communicate and I then set the car to warm up and went back to the house to finish off my coffee.
Nothing in the car to deplete the battery, car is standard.
Frustrating as I have just paid the renewal for the remote services and when I need it, it doesnt work as intended.