This has happened twice in the last 3 months of owning this vehicle. Both times were luckily in uncrowded slow speed areas, and I had nothing in the bed. First time was in a parking lot (without my tonneau installed), the Most recent incident happened as I was reversing out of my driveway and as I Put my Vehicle in Drive slowly moving forward my Tailgate opened Unexpectedly (with a tonneau installed). My tail Gate Did not open fast, it was its standard controlled open.