I've encountered the same issue with my VAIO laptop as well, but for me it turned out the battery was dead and the battery checker application keep displaying notifications that battery was in critical condition. The first thing to do is to reinstall the application. If you receive the same notifications and you know the battery is good,m go to Programs and Features in Control Panel and remove that add-on and that's it. Sometimes various things related to your components are reported incorrectly, that's why the issues and notifications.
Make sure to ask for a second opinion on a local SONY store.
