Not as far as I'm aware is this a new feature @Nitesh95
Have a good look at your settings.
Put the phone in Safe Mode which disables your downloaded app's but let's your stock app's keep working. If the issues stop then this highlights a downloaded app as the possible issue. Come out of Safe Mode and start deleting your most recent downloaded app's one at a time until it stops. https://www.samsung.com/uk/support/mobile-devices/how-to-start-my-galaxy-device-in-safe-mode/
Current Phone ~
Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+
Samsung One Ui 3.1/ Android 11.
I have an S20FE and the same thing is happening to me since February.. I've not been able to solve it but it happens randomly when I have the screen locked (I don't have flashlight button on the lockscreen)
Yes really I also faced this issue and on that time I was not aware to this forum so I took guide from lumenauthority website if you still do not find the right guide then see here.