I was playing a gig the other night when I pulled my jaguar’s neck toward me to bend the note, instead of the usual pulling it away from the neck joint. Low and behold, the guitar went out of tune. I pulled it back and it was fine. After the gig, I went home to check on my other Guitars to make sure it was just an isolated incident- it was not. All of my bolt on necks with a bit of force have some slight side to side movement. All of which except for my 2013 American standard telecaster. I got a little nervous, as immediately the guitar i tested after the jaguar was my 75 deluxe and those CBS era Guitars are known to have bad neck pockets even though it looks pretty good. That one also went out of tune. So I ended up testing all my other guitars with bolt on necks. A combination of Japanese and Mexican Guitars. I’m guessing this is just a byproduct of having bolt on necks sometimes? It is a considerable amount of force. I guess it makes sense, like when you bash your headstock on something by accident (or not) and your guitar goes out of tune.