For awhile now I've been using 64bit ubuntu on my Toshiba C660, and its been fine except more recently I've been getting random power cuts even though my battery is good and whilst my charger is plugged in.
Now I thought it might be due to something wrong in 64bit ubuntu 12.04. So I switched and reinstalled to 32bit ubuntu 12.04. No Help. It did another random power cut.
I get no warning, no freezes. In a way when It does cut off It makes the same noise as when I hold down the power button.
I'm not sure if its to do with Ubuntu and linux or its a hardware issue.