Surface Overheating issue

I love my surface pro 4 and i've been using it longer than any laptop i've ever used before. i've been itching to buy an upgrade for ages, but it's been working so beautifully that i can't justify spending the (quite high) price.

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recently, though, i started playing this 20 year old game called Everquest.

• every time i run this game, the laptop get super hot and the screen starts to flicker.
• the last few times i've played, the battery refuses to charge. it will get stuck at 5% battery life and the icon will say "plugged in, not charging"
• i even resorted to packing the back of the laptop with ice packs to try and cool it down. it did help for a little while, but not fully.

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i've searched online and can't seem to find a solution. there must be something i could be doing. it's a 20 year old game - it really isn't that CPU intensive