I think everything is vibrating on an 'ol bass, and under tension, so things could loosen up, especially strap pins. I play daily for a few hours though.
I haven't checked lately, but I did have some loose-ish screws on my basses. Depends what you mean by loose. Tuning peg screws aren't snugged down real tight, but shouldn't be loose falling out or getting much looser over months of time.
I made some mental note to check them all when I change strings and figure that is enough. Except strap pins, those need to be checked every couple of weeks. I always forget though