I've seen several times where the collision avoidance or adaptive cruise control have failed intermittently, included in published test drives.
For safety issues like that you can report them to NHTSA, which might help elevate the issue?
Hopefully there's a fix coming soon and modifications made at the factory. Even something as simple like a windshield installation can go wrong during manufacturing. The new F150 is being recalled because the windshield may come loose during an accident because they aren't bonded properly...