If it's under a year old it will still be under guarantee, but anyway it is worth having a word with the people you bought it from.
I sounds like a fan has got clogged or something like that. Unless you know what you are doing I think it best to seek advice.
1. the air vent for the fan gets clogged with dust.
2. broken fan
3. when we keep it on the carpet or bed which reduces the flow of air to cool the laptop.
sometimes the fan are nosiy in couple of models. if yours is under warranty contact the tech support first.