I have a 2004 A8L. This morning, the MMI just closed on it's own and the radio stopped. So I turned it on again, but within 3 minutes it shut itself off. This happened 4-5 times. So, I turned it back on to check the battery level. Unfortunately, even with the radio on for the 3 minutes, none of the other buttons work, ie: Car button to check the battery. What happened, it was fine yesterday?