Update: I have asked for change for 2 times, so I have tried 3 s20's in total....But the problem is still there... And my solution is, returned them all and ordered a Snapdragon varient from eBay. Now I've been using it for 2 weeks and everything's just fine. Never experienced the same overheating problem so far. So I can comfirm the problem is with the inferior Exynos chipset. Oh btw, I paid less for a Snapdragon varient (5G version) than the Exynos varient (4G version).
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