I had the upper cover panel removed in the frunk and noticed the nut that holds the 12v battery down was not tightened. The nut had been threaded on a few turns, but there was a visible gap between the nut and the plate that holds the battery in place. My impression is that it had never been tightened at the factory. I tightened it with a 10mm wrench. This was a December 2018 build. Something to check next time you have the cover off.