Our 2020 Ascent also lost
Our 2020 Ascent also lost battery power while at the Oregon coast.
We were parked watching the evening sunset. Went to start the car and the battery was "dead." We used Starlink to send us help. Help was coming from a town 1/2 hour away? About 20 minutes into waiting, I decided to try start the car again. IT STARTED! Called Starlink to cancel the service call. I was told that letting the battery rest lets it recharge?
That's my story and I am sticking to it.
We did take it in when we got home for service. I can't really say what they did? It has acted normal ever since.(last November 2019)
Our service provider is Capital Subaru, Salem, OR