There's one screw that has repeatedly unscrewed itself under the linoleum flooring in my TT. I made a cut and screwed it down the first time I noticed it. Second time I gooped it up with something I thought would lock it in place, but it's coming up again. I think I'll use some epoxy of JBweld next time.
The location is under my fresh water tanks, and I wonder if the stresses on the floor from the weight of water tanks filling and emptying is causing the issue??
No biggie. My TT keeps my dry, and warm or cool, and has a comfortable bed. I can live with a bump in the floor.