[sobjornstad]

I've never had this happen on my 2017 Forester either in ~30,000 miles of highway driving with the adaptive cruise (the Subaru system is fully vision-based with no radar).

The one issue I've noticed is that it sometimes hits the brakes for cars that are obviously exiting the highway because a tiny sliver of the car is still technically in the driving lane, so I've learned to keep my foot over the gas pedal to override it in that case. The amount of braking isn't scary though, it's just annoying because there's no need to slow down at all.