the action on my bass (03 MIA Jazz) is constantly changing. i would imagine because of the neck moving. now it's not that dramatic...... but i would like it to stay in that sweet spot where it's not too high and not too low. if i have a show the next day and i adjust the action i never know what it will be like when i pull it out of the case that night. (again it's not that dramatic). i have a stingray that i pulled out of the closet after three months and the bastartd was still in tune and perfectly set up! FYI I live in MI....if you have atmospheric conditions.