Hello I have a problem where the strings on my bass the last couple of weeks suddenly feels stiffer/got higher tension. The strings are Fender 7250 ml and are quite new. The action is low aswell. The thing is I have tried out a couple of strings over the past six months or so, the last one was a heavier gauge, before I put these on. So it is likely that something has changed on my bass (?) but when I look at the neck the relief is the same (or close to) what it has been. Other than that the bass both feels and looks good, I got it a year ago, should I have someone to look at it/new setup? As you might understand I am not very experienced, only played for a year or so. Would appreciate if someone might help..