If normal diagnostics have not helped (e.g., batt-pull reboot, WIPE, reload OS, etc.), then you indeed need to seek warranty support. You seek that from your original place of purchase, your mobile service provider, or an authorized service center...the method varies by region. When you purchased your device, you should have received documentation detailing your warranty coverage along with methods of using it.
Occam's Razor nearly always applies when troubleshooting technology issues!
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