How long have you owned the phone?
You may still be in your cooling off period to have it swapped out.
If you moved information from your iPhone to your Samsung phone then how did you do this ?
I ask as sometimes this process can cause issues.
It might be beneficial to factory reset and set the phone up as new.
You could try > 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 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.
I wish you all the best. 😎
Daily Driver > Samsung Galaxy s²² Ultra 256Gb in Phantom Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "