That's the message I get half the time now when plugging in my iPhone 6 Plus into my dock. Funny thing is, I'm plugging into a 30 pin to lightning adapter attached to an old Apple dock from Apple (their official one with a 30 pin connector, see the attached photos). My iPhone will still charge despite the occasional warning message. But can someone explain why I get this message to begin with? It's been happening more frequently lately. Thanks.