the only reason I could see the system being an issue is if you have it playing often without the car running......

In my 740iL I have 4 monitors 4 amps and a whole slew of electornic items. I rode that system for years without any issues until one or two of my three batteries started having charging issues. Since I had a dual battery isolator on the car I could let my two batteries that were dedicated to the system fully discharge and still start the car with the stock battery. My problem came after my two aux batteries reached their 5 year life span and was not recieving their charge properly and I started having my TransFailsafe issue and my alternator is now bad I believe....

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Robert

1994 740iL
2001 X5 4.4i Sport
2004 Kawasaki ZX-6R
2009 VW Jetta S