OP, Thanks.
I was wondering at what quality level the speakers were. I would think that probability of screws loosening themselves would partially be a function of the initial quality of construction.
Do you have a screw loose?
Just a friendly beginning of the year PSA saying to check the screws on your drivers to see if they are snug enough. Just checked mine (after I finally found my torx screw bits). Surprised how loose they'd become. Now to find a bit that fits the one in my head...