Mine does this too! As a matter of fact, it's been doing it intermittently when I open the trunk, passenger or driver door. My dealer can't seem to "replicate" the problem.Yup I still have the noise too and have had it intermittently since new. Just heard it the other day when opening the passenger door (previously only noticed when opening drivers door). It must have something to do with the dome lights coming on and interfering with the radio/amplifiers somehow? Those who have this issue, which stereo do you have? I have the Shaker Pro.