Screen touch becomes unscrollable and can't fling back or go to home screen using gesture navigation. I tried locking and unlocking the phone again but it has no effect. After one minute or so and trying locking and unlocking again and again it start...

When phone is charging touch becomes less responsive and jerks sometimes when scrolling. My phone is. Galaxy A16 4G

How to check warranty I checked on support tab my device is showing but there's no option to check warranty