[eNCore]

I use an iPhone/iPod auxiliary cable that I bought from Amazon to listen to music on my iPhone, because the BMW one is too short. I used the cable on my M3 and now my M5. It worked fine on the M3 and the M5 for a couple hundred miles. Now the aux works fine, but the USB which charges the phone doesn't. It will repeatedly go on and off while charging the phone. I thought it was the cable's problem, but that wasn't it. Then I thought it might be the plug's problem, so I asked the dealer to look into the problem while getting my 1,200 mile service done. It turned out it works with the BMW cable, so they told me it's the cable. BUT, my questions is, how come it worked of the M3 and the M5 for a coulple hundred miles? Anyone have an idea?