The screws on my door hitch keep coming off.
I first noticed it 8 months after buying my car from a used car dealership.
There were only 2 screws in the holes, when there should be 3.
One was loose. So I tightened up the 2 screws that were left.
I check it again a month later. Both screws were loose, so I tightened them down again.
A few weeks ago, I checked them again and they all were gone.
Why the F#@% is this happening?