I know the hinge on the upper part of a 3ds is supposed to wobble a little bit. As long as it clicks it's all fine according to nintendo's website. But it's just so annoying, specially when you are playing in bed and you hold the console in a sorta vertical angle the screen goes one way and another. My new 3ds has this wobbly hinge and that's the main reason why I still play my old3ds instead. Yes, my o3ds has very solid hinge even though I've been using it for years. Do you guys know if it's possible to open up the console and somehow tighten the hinge inside?