Fmv 7000na5

automatically shutting down is an indication of thermal issue or over heating. how ever when you say automatically shutsdown does the computer turns off? try checking your heatsink fan and the heat sink as well as the air vents. make sure all the air vents are free from obstruction and the heatsink is clear of all dust which can prevent the air from cooling your processor. if still it continues change heatsink fan and heatsink. make sure to apply the thermal grease between heatsink and processor