DIAGNOSIS This is a known compatibility issue with the Adaptive-Sync/G-Sync Compatible mode and specific refresh rates or driver states.
FIX Open the monitor OSD. Go to GamePlus > Adaptive-Sync and set it to Off. Then, open NVIDIA Control Panel on your PC. Under Display, navigate to "Set up G-SYNC." Ensure the box for "Enable G-SYNC, G-SYNC Compatible" is checked for this display. Apply. The flickering should stop. This forces the control to the NVIDIA driver.
IF THAT DIDN'T WORK Cap your frame rate 3-5 FPS below the monitor's maximum refresh rate (e.g., 172 FPS cap for 175Hz) using NVIDIA Inspector or in-game settings. This prevents the sync from operating at its upper limit.
HEADS UP This monitor is not certified as G-SYNC Ultimate. It is G-SYNC Compatible via Adaptive-Sync. Inherent minor flickering in certain scenes, especially with low framerates, is a limitation of the technology.