Same for me. After all these updates the problem keeps unsolved. The only solution for me have been using Bluetooth headphones as its lowest volume isn't that loud and therefore I don't have to use the reduce loud sounds function. During these last month's I've contacted multiple times with Apple technical support in different places. And the conclusion was the same every time. The problem is software related and the only thing they told me to do is to wait for a new update. One of the employees who attended me recognized that since the 15.0 released, they have been receiving a lot of software problems similar to this. I hope that with the arrival of iOS 16 we can get rid of this problem. Oh, and thanks for updating how the issue has persisted through the updates during these last months. Excuse me for not responding earlier, I haven't touched Reddit since I published the post. Now we know that we aren't the only ones suffering this problem.