I recently purchased a 2014 Gibson Les Paul Classic that is new. I have noticed that there is a considerable amount of feedback when the strings are not held on to and if you barely bump the body of the guitar, it sounds like something might be loose in the body and causes a lot of noise. What could this be?
I've come across this many times. More often than not it's a loose bridge ground. Inside the cavity on the back of the guitar there is a ground wire that comes from the bridge, and attaches (with solder) to one of the pots. What can happen is that this connection is either loose or touching something it isn't suppose to. Check all wiring within the cavity. If you haven't done a lot of soldering, I would suggest taking it to a local guitar tech. There's a good bit of info here: https://bmfmguitars.wordpress.com/
