We’ve seen on some guitars, Strats and PV Wolfgang for example,  the wood around the jack prevents the jack from spreading open exactly right unless it’s rotated to just the right position… If the jack is giving you trouble you can modify the jack by re-bending and cutting the “ring” contact like so, here’s a picture: http://www.creationaudiolabs.com/resources/Redeemer%20Strat%20Mod.pdf
If you’d rather get a jack already modified, let us know and we will get one for you.

Also, it is a good idea to keep the internal wiring in your guitar neat, try to trim the wires so they are long enough to service your guitar, but not so long that you have a rats nest in there… messy wiring is more prone to picking up hums and buzzes.

Speaking of hums and buzzes – watch out for the ground connections to the shielding of your guitar’s cavity, the faceplate and the bridge – it’s easy to accidentally leave them disconnected… If you are uncomfortable doing this, please consult a reputable guitar tech in your locality.