I recently had a new issue start with my 2009 Fortwo, which has progressively gotten worse. When I start the car, the speaker by the driver side starts to go into overdrive with bass. I checked the bass control and it’s on zero. I figured I don’t need the radio, so I would just turn it off but the speaker continues with the extreme bass. Even if I turn the car off, it still keeps going. After driving for 1-3 minutes it finally goes away but I’m worried I’ll soon have hearing loss from dealing with this every day, it’s that bad. What exactly could be causing this?