Also make sure you have cleared system cach after any update. In addition, please post your battery stats so we can see if there is a rogue app/apps causing the issue. Settings> Battery & Device Care> battery. click on graph and post a screenshot of the app usage.
This is 2 months old phone and haven't got any update yet. Also i have already done wipe cache partition.
There are no apps under Battery & Device care as I have not opened any apps.
Is it because S21 has plastic back so heat is absorbed rather than dissipation?
I have bought directly from samsung and can ask for repair as its only 2 months old phone. My phone temp goes down to 29 and stays there if phone idle and screen off but if i start using it goes above 35 easily within 5-10 min.
What is your phone's ideal temp ?
And till what level temperature goes when you use it normally for 5-10 min?