Hey.. I bought this second hand (but great condition, looked after etc) and since I've had it I've noticed a couple of things which are really starting to bug me. In embedded video like YouTube and other video-based websites, the video will pause for a couple of seconds now and again - I've also noticed this in animated gifs too now. Also, in Firefox, scrolling with the up and down keys sometimes takes a couple of seconds before it moves, same happens with two fingers scrolling on the track-pad and mouse roll-wheel. Now, whilst typing this, sometimes the text won't show up immediately and will appear really quickly (as if I'm typing a lot faster) briefly. Any idea what's going on here? Thanks!