I have a Lenovo 3000 G530 Laptop, that shuts down on its own, after running, for 5-20 minutes. The Lenovo, has an approx, 250GB SSD, with 3GB of RAM installed, and is running Ubuntu 14.04.4 as the OS. I originally thought that it was possibly a corrupt battery causing the issue, so today I only used the AC adapter to power the machine. The system powered up fine, and when I opened a web browser the system shut off instantly. With the battery out, and the AC adapter unplugged, I held down the power button for 60 seconds, with hopes of resetting/draining the power and starting over. Unfortunately, after booting up, (Still without the battery) the system shut down in a few minutes. I am not sure if this is a hardware issue, or if there are some Ubuntu settings that I am not aware of, that could be causing this issue, but I would really appreciate some advice. Thank you very much.