BMWnoob

Edit: Now my cabin lights (overhead and back lights) flash on and off while I'm driving. Feels like a night club in my car. I left my car unattended for 30 min and my battery drained. It's gotten to the point where I have to shove a dime in the light control button to keep it from flashing on. Any thoughts/ideas? Its driving me nuts.

How can I check?

It's a 2003 M3 with SMG. It will do thiis mainly when I shift gears, and sometimes it will just reset while i'm driving on the freeway. Right as I shift, the lights on the dash flash and then audio cuts out for 3 seconds while the sub remains playing. I thought it was my ipod at first, but then same thing happened with the radio playing. Now I dunno what is going on. Is my ground connection loose?

It's been about 2 months since install, and now when I shift sometimes (I have SMG) my audio will cut out for like 3 seconds (Subwoofer still plays) and then comes back on. Then my dashboard will light up, my dynamic stability control light, etc... It only flashes for a quick second but does this random. Also, sometimes the entire D3 unit will shut off and reset, causing the music to obviously cut out for 3 seconds while it restarts. what the heck is going on? Thanks in advance.