Recently, my Bose S1 pro has been making a hum/hiss noise about 10 seconds after I turn it on. The noise increases when I turn up the volume on input 1 and 2 even when it’s not plugged in. The hum/hiss is there when music is playing. I think it started after I charged up the battery to full. I have tried having it plugged in but still makes the sound.
Any help/people who have experienced these issues is massively appreciated.