My girlfriend's 2005 Astra CDTi 150 Design has the uprated stereo and speakers. When we first got the car, no matter how loud the stereo was there was no vibration or distruption in the sound -the bass was excellent. However, recently we've norticed that there seems to be a vibration from the driver's door panel when music is turned up loud. Is there a known issue with these cars? Is it just because of aging? We wondered if there's some way to tighten up the door panel if that is what's causing the vibration.
Any advice would be greatly appreciated.