Car Will Not Start problems of the 2021 Subaru Outback

I bought this 2021 Subaru Outback in Jan 2, 2021. In mid Feb, I drove the Outback to lake tahoe. On my way, I went to costco gas station for gas after 1 hour highway driving. The car was just dead after refueling. I called roadside assistance not knowing what happened. The car was jumpstarted. I was able to continue my trip and back home. After I was back home, I drove the car to the dealer that sold the car. I was told it was battery problem and a new battery was installed. A few weeks later, my car couldn't start in my garage on a Saturday morning. I had to jumpstart the car using a handheld battery myself. I went to the dealership and was told they couldn't find anything wrong. I think Subaru Outback has a defect in electric system that drain the battery.