Randomly Increasing Volume To Maximum On iPhone 15

I'm expecting an issue with my iPhone 15, where the volume randomly increases to the maximum level on its own. This problem has been occuring since I purchased the device, and it happens unpredictedly. I always keep the phone updated to the latest iOS version, so the issue persists even with the newest software. I have also tried basic troubleshooting steps, such as restarting the phone and has been hard reseted, but it has not resolved the problem.