When I first got my car (GLA250, Audio 20) my text message icon would show if I had new text messages. I could also view new messages on the head unit. But of-late the message icon doesn't show, even when I receive a message. I've checked all of my settings but don't see anything that sticks out as the problem. Does anybody have an idea what might be wrong, or what specifically I should check? I have an iPhone 6. Thanks.