go to https://www.sammobile.com/ select the right firmware of your device according to your region . then reinstall the firmware and find if problem still remains same then consult Samsung CS if the warranty valid they will replace firmware or faulty...

did yo upgrade you android manually? if yes then its software issue or not than go to warranty centre without wasting of time its hardware problems

check it using in night or in dark places some time light effects.

check out sensor may dirty or you are using 9d glass protector.

bro google ban call recorder even third party call recorder in android under the privacy flag.