1.5 year old laptop means you probably have a lot of dust, hair, and other garbage built up inside of your laptop causing it to overheat and shutdown. Your laptop is saying, "hey stupid how about you clean me!" kind of like when someone writes wash me on the back of a car when it is all dirty. Condensed can of air should do the trick in cleaning out your PC. If you are not comfortable in opening up your laptop then take it to a PC repair shop and have them clean out the inside for you. It will probably cost you about $50 I'm guessing on that price though. Most laptops can be brought back to life after cleaning out the inside of it.