I'm used to playing an Epiphone dot but I traded it away and now I have an Eric Johnson thinline strat. I'm not sure if this is normal or not but sometimes it feels like the high e slips off the fretboard so I looked up how to fix it and came across this video. He suggests loosening the neckplate screws about a 1/2 turn and then putting pressure on the neck and screwing it back up. When I did it I noticed a creaking sound when I loosened each screw. Is this normal? Did I damage the guitar?