Does anyone find their kindle 2's buttons to be mushy? In particular, my "prev page" button is much more mushy than the other buttons, unless I push it just right. In particular it clicks 'in' (not very loud), but does not audible click 'out'. This is when pushing on the inside (side next to the screen). It's bugging me enough to maybe exchange... Does anyone know if amazon will send out a new replacement before they receive the old one, or would I be without the kindle for a couple weeks? I love it otherwise!