Even I am facing same issue on my s21 fe ..I have even visited the service centre. They have inspected my phone and there are no damages ,but yet they told since my device is out of warranty I have to pay for the display replacement .since it was not...
Same issue is faced by me too on my s21 fe 5g,I have also visited service centre they have checked my phone throughly and it is not the device issue that is causing the error it's samsungs fault .since my device Is out of warranty the service centre ...