More than likely the problem here is overheating. 'But I am not running intensive graphic processes and the like' you say. The studio is renown for having a particularly poor heat dissipation system, especially if you have an i7 or higher end graphics card.
There is no fix for this, other than Dell replacing the motherboard which does not fix the problem, only makes it slightly better until the overheating process begins again and you need to get another motherboard.
Too much power within a poorly designed case.