04-13-2015 05:23 AM
Welcome to the Forums
As per the query we understood that you facing issue with auto shutdown in your Lenovo G50-70 laptop.
Try to reinstall the energy management and check for the issue, also check if there is damage to the charging port.
Click here for the energy management for windows 7.
Click here for the energy management for windows 8.1.
Hope this helps. Do post back if the issue persists!