Ok i got it somehow fixed (temporary). I had the problem that the bottom speaker was very Low or had no Sound, so i tried pushing at different spots on the phone. I pressed the top left corner led light with my left thumb and the bottom right corner with the other one and pressed. The Sound came back but as soon as i stopped pressing it became again very Low. What it fixed was i went into safety mode and did the speaker and mic test and pressed lightly the spots i mentioned before. I rebootet the phone and it works. As soon as it gets Low i need to simply press the spots or restart and etc. Hope it works for you guys(from germany sry for Bad english and autocorrect :))
Edit1: It helps muuuch better if you Just press the thumb against the whole top speaker, Front camera and back camera (maybe because of Sensors) and the other one against the bottom right corner
