Vehicles rear windshield shatters on its own without any impact. It’s is a known problem for the manufacture cause they have come out with a service bulletin. It’s a safety issue due to when driving or even staying stationary rear windshield will break. All 2019 and 2020 have this problem. Windshield shatters due to manufacturer making poor quality product and ds not want to make it a recall even tho it’s a safety concern.