OK here's the deal: P-Bass body, Mighty Mite fretless neck, tapewound strings. At the last job, late first set, the strings kept loosing tension and flopped against the fingerboard when I was playing in low positions. It was as if the pull from my left hand and the push from my right were bending the neck back. Pulled out the back up and finished the gig. Home, I tightened the neck screws but still no joy. Full disclosure: the bass came from a cold car to a warm room. I love this bass but it's always been a bit slappy for my taste, no matter how much I raise the action. Just thought I'd get some opinions before it goes into the shop. Thanks fellow Low-Enders!