This has happened twice...I have a 2012 Audi S5 (love, love, love it) & I was on a phone call with the engine running, the AC on, & the stereo on when all at once everything shut off. I restarted the car, but the check engine light came on. Everything worked & I drove home. The next morning, the check engine light was out, but I took it to the dealer. They ran the diagnostics...he said it had a usage of up to 17 amps & maybe an alternator would be the next step. He said to bring it back if it did it again. It's been over a month, but the incident happened again yesterday, only this time the check engine light did not come on. Has anyone else had this problem? My car has 46,000 miles...