My first G752VS OC from Amazon had the same issue. I attempted the various suggested fixes with minimal success. I eventually contacted Amazon and explained the issue. They exchanged the laptop with no hassle. My new G752VS OC did not have any sound issues. I also noticed the volume is much louder on this one. I am not sure if they made adjustments in manufacturing since coming out with these first 10 series graphics laptops but my original 'Check NO#' on box was in the 3800s. The new laptop 'Check NO#' on box was in the 6200s. I would definitely if within your return period contact seller for a replacement. This is why I usually buy through Amazon. They make it hassle free and a great experience.
Gaming Rig: AMD Ryzen 9 9950x3d, ASUS X870E-E ROG Strix Gaming WiFi, G.Skill Flare X5 Series 64GB DDR5 CL28, XFX Radeon RX 9070XT Mercury Magnetic Air OC 16GB RGB, Samsung 9100 Pro 2TB NVMe, 2x Samsung 990 Pro 4TB NVMe, and Win 11
Gaming Laptop: [ASUS ROG Strix Scar 17 (2022)] i9 12900H, 32GB DDR4, RTX 3070 Ti, Samsung 980 Pro 2TB NVMe, WD Black SN850X 4TB NVMe, and Win 11