Vivo V30 Lite Screen Keeps Going Black Despite Warranty Repair

I purchased a Vivo V30 Lite smartphone from the Vatan Bilgisayar Kocaeli İzmit branch. For approximately 40 days, since June 3, I have been experiencing a recurring issue where the phone's display suddenly goes completely black. The screen turns off without warning, nothing is visible, and this problem occurs multiple times throughout the day, making it impossible to use the device reliably.

To resolve this issue, I returned the phone to the Vatan Bilgisayar Kocaeli İzmit store, and it was sent to an authorized service center under warranty. However, after the device was returned to me, the exact same problem continued. The service intervention did not provide a permanent solution, and the display blackout issue remains unresolved. My phone is still covered by its manufacturer's warranty.

I respectfully request that this recurring display problem be permanently repaired. If the issue cannot be resolved through an effective repair, I request that my Vivo V30 Lite be replaced with a new, fully functional device in accordance with the terms of the warranty.