Just to answer this old question. The engineering on this device is very tight and even if the volume buttons are in place, they can still be slightly out, or the volume button on the back case may be out. To resolve the issue with the volume up button always being pressed when the phone is reassembled, I removed the volume button from the back case - pull back the white plastic tab slightly and the button comes out. I then used a fine bit of sandpaper to take some of the head from the tip of the volume button plunger, not much. Placed it back on the case, that did the trick and it now works as it should.