I wouldn't recommend to try a DIY fix yourself as this would invalidate the Manufacturing Warranty , and Samsung also would decline repair probably @Minirook
The issue could be hardware or software or something that's been downloaded.
This link may help but do be aware a Hard Reset is akin to a Factory Reset thus may delete your information meaning setting up the phone again.
Another possible solution is > 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.
Other than that let a Samsung Service Centre have hands on.
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. "
