Nope, haven't installed anything new, except for EasyCleaner. Haven't dropped the laptop or anything. The only semi-recent thing is that I have moved to the UK, and have been using the laptop here for the last 6 weeks - it was originally bought and used in Australia. However the voltage of the UK and Australia are the same. The only other newish thing, is that since I moved here, I have been using one of those laptop cooler fan things, that plugs into the USB.
Apart from that, I haven't done anything different.