dialing

I have an iPhone 5 (running iOS 7.1.2) paired to my 2014 Volt with navigation. Everything works as expected, but several times just after startup, I've had the car spontaneously try to call my own cell phone. The fan slows down, the radio mutes, the screen in the center stack says it's calling...

I love my Volt, but I do have one complaint...using my iPhone to make handsfree Bluetooth calls is painfully slow and clumsy. From the time I press the button on the steering wheel, until my phone actually begins to dial, it takes no less than 25 seconds of waiting and answering prompts. Onstar...