Nail/screw head in floor Cougar 2015 303RLS

[Howie]

Does anyone have any experience with a nail or screw head starting to backout of the floor? We noticed it in the floor starting to push up on the vinyl flooring. I tried a hammer and it didn't move and it appeared that if I keep hitting it I might actually cause the head to puncture through the flooring. The belly is enclosed so being able to look underneath is a problem and probably not going to be able to see anything anyway. Is there any solution to repair/fix that anyone is aware of?