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Same, mine picked up a small bush, and locked up.Sounds like the backup sensor is detecting something. First time it happened to me was backing out of a parking space with bushes behind. Locked up with a horrible noise and scared the crap out of me. Thought I'd hit something for sure.
Mine gets squirrely when backing out of parking slots sometimes for no reason. I was backing up by a restaurant to go eat, and a small branch far away set it off and the truck locked up. Boy did I get a lot of are U friggin stupid looks. So I have learned to turn off when I need to.In the beginning I had to turn it off because the brakes would engage every 2 feet and I'd look like an idiot.
The software updates have made mine better but I still have an issue with shadows and shine (rain) on the road.