First tell me which sim do you use, Airtel or Jio. If you use Jio then this happens mostly in this network and if you use Airtel then you won't find any such issues, so change you network provider to Airtel 5G plus ❤
Bro switch to Airtel 5G plus it never switches to 4g I use it even my brother phone other brand like Mediatek 700 SoCs that really gives a powerful 5g network even I turned on hotspot....
Brother apko apne mobile ke change Krna hoga means Exynos SoCs is not good for 5g because 5g bahot powerful chipset mangta h jaise SNAPDRAGON flagship SoC and ye problem bass ek chizz se theek ho skti h airtel 5g network...