My MZ-R700 has done that too, whenever I would carry it in my pocket while moving it would seem to skip a litte, then for a while it would skip even while it was not moving. That seems to have fixed itself, although I ended up getting a cheap MZ-R500 as a beater unit to use when I have to carry it in my pocket for lond periods of time. Another thing about your volume button issue, I thought I was having a similar problem, but it turns out that the vol buttons are positioned in a way that you put a timy amount of pressure on the headpgone jack when you touch the button, assuming you use your right hand. Another very common problem with the R700 is the headphone jack gets messed up and a little pressure will cause to sound to cut out and distort. Cramming a 4-layer wedge of paper between the case and the jack fixed it for me, I don't know if it would work for you. Wiggle the jack around a bit to see if the sound changes at all. Good luck. Not bad for a first post, eh? -Darren