The most common reasons for that are
1. power adaptor or battery isn't working - power problem. Some laptops require the battery to be in the machine even when it's running of the adaptor. If it runs out of 'juice' it will just go off suddenly.
2. overheating - It can get full of dust and dander and overheat the cpu which will also cause the machine to go off suddenly. It shuts off to protect the cpu from burning up. Sometimes if they get hot enough it can still take out the cpu... If the cpu fan stops working it will also overheat.
3. Control Panel - Power settings - check to see if there's a timer set to turn it off after so long etc.
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