Settings>notifications turn off the respective toggles

Make sure that single tap mode is turned off if notgoto settings>accessibility >single tap mode

You have to use your mobile with Indian sim for 5 to 10mins.After that u can use international sim card

goto SETTINGS>ACCESSIBILITY>DIRECTION LOCKand then select SCREEN LOCK TYPEenter directions to unlock select PIN(or)PASSWORD(or)PATTERNset password acc to your selected typecomeback TURN OFF the toggle located at the top that's it..

yes it happened on my phone(s8) too but it lasted only for few minites.If this is not case with your phone try to reset or cotact the service centre