Most of the time, if somebody is messing with your lugnuts it will be a random wheel, one side or all 4. If lugnuts are gonna come loose on their own, it will be the front 2. Why, the torque flex in the tire/wheel while turning. This is probably the case.
I always periodically check the lugnuts on all my rigs, no matter who worked on my rigs. I have Les Schwab hand tighten them by hand, not a gun. And I watch them do it. They have a huge tendency to over torque with the gun.
When I worked there, I never had any issues of wheels coming off of rigs I worked on. It's all about getting a even torque on the wheels. And go over them twice to double check them. Especially, with aftermarket steel wheels! Sometimes the smaller bolt patterns won't hold the tq well either, with large tires.