About 15 months ago, my 2016 Durango started making an odd noise somewhere behind the instrument cluster. It happens mainly on hotter days. It's not a rattle, per se, because it doesn't happen when I hit a bump or rough pavement. I'm cruising along on perfectly smooth pavement and it happens: about 2 seconds of a sound like someone rattling marbles in a can. Or maybe like a ratchet wrench going for a couple of spins. Then it disappears, only to sound off again 30 seconds, 5 minutes, 10 minutes, however-many-minutes later. There's no pattern to it and it doesn't appear to be caused by any outside impact or vibration. I'm sure if I take it to the dealership they'll fail to replicate the sound and I'll have wasted a trip. I made an audio recording of it happening. Three times, actually, and I removed all the silence in-between. So it doesn't happen multiple times in a row like in the audio recording. This was over about 2 minutes of recording. Please have a listen and tell me if you have any guesses. It's driving me freaking nuts!!!