I will check the frunk! The loud clunking happened when I was leaving my house, twice on cold mornings; in Drive and very slow acceleration down the incline of our road. On one occasion, it happened under mild acceleration without the brakes applied (lasted 2-3 seconds and went away) and the other time it happened when applying the brakes or when gently accelerating (2-3 sec each). The first time, it was after a huge freezing rain storm that I thought might have blown water into everything (Nor'easter with 50-60 mph gusts) and then frozen. The second time was a couple weeks later. Plugged in both times before departure, but not actively charging (already at my 75% charge limit), so I'm not sure if this clunk is the same as the sound linked to the expanding of the battery casing (?) as nothing was warmed up in 60 sec or less.