I rented a car in the UK a few years ago and by the end of the trip I was ready to set it on fire.

- Adaptive cruise control would randomly slam on the brakes on the motorway (just passed a 30 kph exit, the speed limit must be 30 now!), or match speed with a car in the next lane that was I trying to pass

- Emergency braking would trigger if I got too close to a car that was turning out of my lane, or a shrub while parking

- Lane assist reenabled itself every time I started the car

- Radar system would fail every ~3 starts, which would disable adaptive cruise control (ok) and blast a warning sound (bad)

At least now I know that if I'm shopping for a car in the future, one of my criteria needs to be "won't actively try to kill me".