According to Sony, in rare instances the Vaio VPCF11 and VPCCW2 series of notebooks may overheat, resulting in deformation of the keyboard or external casing and a potential burn hazard to users. If you own one of these series models, Sony recommends that you download and install a firmware update specifically designed to prevent the potential overheating problem. Sony advises customers not to return affected computers to their retailer, but to download the firmware update.