Using an external fan worked for me.
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Hey, I saw a video of someone using a fan to avoid the flickering when the surface overheats, i bought it and it work.
I bought my surface a year ago and its really working, i have tested while gaming, using different software like Kita and using it for really long hours.https://www.amazon.com/gp/product/B003XN24GY/ref=oh_aui_detailpage_o00_s00?ie=UTF8&psc=1
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It works... but eventually it starts flickering again.
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It rarely flicks now, only when I use it in places that are really warm and its after using it for more than 8 hours.