Yes , I am observing the heating issue on the back with/Without the back case while watching videos on prime with a full resolution with the speaker. Today is my 2nd day with my new S20 FE 5G device.
I am keeping my phone with network preference 4G/3G/2G with location off/Bluetooth off and no application running in the background, still heating is observed. Hope it is not my hardware issue.
For the time being i have updated to 60hz standard refresh rate and also monitoring the heating issue with standard setting . I will track for 5-6 days as i think 2 days is too soon to reach or make an such conclusions on phone.
But the phone is getting heated up from back and that heat is affecting the main screen portions also for me