Sound issues, volume low, no bass, sound is not full
When playing music by Bluetooth, iPhone speakers, or any device, the sound is low, bass is not there, no full sound. It sounds like an old transistor radio. I have done total resets, erased all data and started over, and checked every setting in the music app. Also Bluetooth will get scratching and choppy, while using it. Like it is going out of range, but can be sitting 1 foot away from recurved, or even be in my car. Phone worked fine when I first got it, just recently had an issue. Volume level will also have a mind of its own. It goes up and down as it pleases. Almost like someone else has control of it??
iPhone 11 Pro Max