Screen flickering/flashes suddenly

[Aks77]

From last few days the device screen flickering/flashing suddenly whenever there is a new notifications, while charging and sometimes when device is locked.

Whats the problem, how to resolve the issue?

Anyone help? 

[Samsung_Support2]

Dear Samsung Member,

Greetings from Samsung Customer Support!

We request you to kindly visit the service center for a physical inspection of your device. You can locate your nearest service center with this given link: https://www.samsung.com/in/support/service-center/  

Thank you for writing to Samsung.

Warm Regards,
Samsung Customer Support

[ArunAravind25]

Which mobile it is ??