I have a JP7 with a roasted maple neck (Pao Ferro fretboard). I got the guitar about 8 months ago, and to my liking the action was a bit too low, and the neck was too straight, so I adjusted the truss rod a bit to get a little more bow in it and that also resulted in a higher action which I liked more.
Now, maybe 3 or 4 months after that adjustment, I noticed the action got even higher, and also the neck seems to have gotten more bow in it by itself.
Is this maybe weather related? It's getting colder here and the heater's on in my house, I am not sure if that would have an effect on the neck.
Also: the neck is a roasted maple neck, which is said to be more stable than a non-roasted neck.
So, I am wondering what causes the action to become higher by itself?
And another question: is it ok to re-adjust the truss rod every once in a while, like once in 2 months or so? Or would that be bad for the neck to re-adjust it that often if needed?
Yep, you are experiencing very common symptoms of weather, and it's no problem to adjust the truss rod *if* that's what needs to be adjusted. Sometimes just lowering the bridge a hair will lower your action, and I typically do that before making action adjustments with the truss rod.