2025 Subaru Crosstrek

I am reporting a possible power train/drivetrain issue with a 2025 Subaru Crosstrek Wilderness. At steady highway speeds, most noticeably around 72–76 mph under light accelerator load, the vehicle produces a persistent high-frequency ringing/whining tone throughout the cabin. The noise stops when I lift off the accelerator and rarely occurs when traveling downhill, which suggests it may be related to drivetrain load rather than ordinary wind, road, or tire noise. The suspected component or system is UNKNOWN, but based on the operating conditions it may involve the CVT, differential, or related drivetrain/power train components. The vehicle is available for inspection upon request. The issue has been reproduced and confirmed by a Subaru dealer. The vehicle was previously inspected by the dealer, and the rear differential was replaced during an attempted repair, but the noise persisted. The vehicle was returned for additional diagnosis, and dealership personnel confirmed the same noise. The manufacturer later stated that the condition was considered a normal characteristic after comparison with another like-model Crosstrek Wilderness, but no specific root cause or technical explanation was provided. My safety concern is that a persistent, load-dependent drivetrain noise at highway speeds could indicate abnormal wear, resonance, or mechanical instability in the CVT, differential, or related power train components. If the condition reflects an unresolved defect, it could potentially lead to premature drivetrain failure or loss of power while driving at highway speeds. There have been no warning lamps or dashboard messages associated with the condition. The issue first appeared while the vehicle was still very new and under factory warranty, and it remains unresolved.