When you took it in the first time did they just replace the belt? There was a sib or something that a fault in the frame of some cars (07 coupe i know for sure) made it so when you went over bumps it flexed up and rubbed against the alternator belt, which obviously will lead to it fraying and eventually snapping. Look into it quick before your warranty is up.
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2007 335i, Space Gray, Black/Alum, Sports, Prem, CA, Navi, iPod
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