Resource intensive operations such as charging / fast charging will cause the phone to warm up as well as making video calls as this is using the Camera module too @SlimsS24
If a case and or screen protector is fitted this can also hinder heat dissipation.
I use a Samsung Wireless Charging Stand that has an inbuilt fan that helps keep the phone cool when it's on fast charge.
A phone should never become too hot to hold.
If the phone is overheating to a high extent than it would tell you via a pop up warning ,and in extreme circumstances auto shut down.
Please ensure your using a Samsung charging kit or a reputable branded option.
You could try this troubleshooting step > Clear Cache Files from the phone's System Partition Section > https://www.samsung.com/uk/support/mobile-devices/how-do-i-clear-the-cache-on-my-device/ You may need to insert your earphones or hook upto a powered On Laptop or use a Tv's USB Port to access the Clear Partition Section. This may help with lag or stutters as this clears the phone of old/unused or broken cache files.There is also a Repair Apps option in the Menu System too.
If I can be of any further help then please don't hesitate to ask. 😎
Daily Driver > Samsung Galaxy s²⁵ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
