Laptop glitches out after a few minutes of gaming

85 C is a bit high for regular use. I would guess and it's only a guess that if the fans are spinning properly and that the laptop is new within 3 months and it isn't being used in an autobody or carpenters shop then it's either a faulty video card or that they didn't use enough thermal paste or they used way too much. If it's a video card error you could try plugging in an external monitor and see how that fairs try both hdmi and vga if it has two. You can also run something like GPU-Z a free diagnostic tool that can log to a text file the temperatures in the background when you're playing a game. I'd run a benchmark test too and see what that turns up.

FYI in an autobody shop laptop will suck up metal fragments from sanding very very bad and will short out your computer, the fans will also collect these metal fragments due to the magnets in the motors. In a carpenters shop they suck up sawdust which is not as bad but still not ideal at all and once the fins of the heatsink clog up your system will over heat until they are cleaned. Symptoms range from shut downs to the system becoming extremely sluggish to crashing completely to almost booting or only staying on for a few minutes then shutting off during boot up then going back to a few minutes use after system has been off for a while where it's cool again.