Holy crap, I totally by chance discovered that my front axle nut is loose on both front wheels.

I have a 2019 Q50, and when my mechanic saw the issue, he was baffled. He said he’s never seen anything like both axle nuts being loose nearly to the pin on both wheels, especially on a car that hasn’t had work done in that area. Other than routine brake changes, neither the rotors nor axles have ever been touched. I’ve owned this car since day one. There’s no damage to the elbow joint, so I don’t understand how vibrations could have caused both sides to loosen. He mentioned that, at the speeds I drive on the highway, the wheels could have easily detached. Is this something that commonly happens? He said he’s tightened everything now, but should I be concerned they could loosen again? I’d appreciate any thoughts, ideas, or suggestions. Thanks!