Hi comtar,
Welcome to Sony Community!
We apologize for this inconvenience. May I know what is the model name and the current operating system of your laptop?
There are several reasons why the laptop shuts down unexpectedly, it could be a battery issue, outdated drivers / software or failing hard drive. Several test and troubleshooting steps are needed to isolate the issue.
1. Check the condition of the battery.
2. Disable Battery Care function (if present) in VAIO Control Center
3. Reinstall Sony Shared Library, Sony Notebook Utilities and/or VAIO Control Panel (these can be found in Sony Website
4. Install all available Sony updates
5. You can also perform a Vaio Hardware Diagnostics
Please observe the performance of the laptop.
Regards,
Jen
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