Give it plenty of ventilation, maybe chuck an extra fan in or something. Systems with integrated GPUs aren't exactly designed for gaming and you could simply be putting your system under a hell of a lot of stress by using it for a purpose the components simply aren't designed for, with the heatwave tipping it over the edge.|
As a comparison (and not a brag in any way), my system is well ventilated with decent fans and a lot of grilles in the case, and is kept in an open space where air has plenty of room to circulate. In its current position, temperatures rarely exceed 35 celsius even in current weather. In its old place, where it was underneath a desk in a home office, it would regularly reach 60+ celsius.
Never underestimate the impact that positioning can have on heat distribution.
3DS: 4055-2781-2855 Xbox: spamdangled PSN: dark_morgan Wii U: Spamdangle Steam: spamdangled