Funny you should say...waiting for a tow truck right now.
I've had my 2009 C70 in at the dealership 3xs this month. Once was for general service work, but a little over a week later was back in for a 'dead battery' despite having it checked as fine sure the service check.
They said a bulletin had been sent out saying it was a software issue and that with an upgrade it should be fine. Now it's a week later and instead of waiting for roadside to jump my car...I'm waiting for a tow...because it just clicks when I turn the key eventhough there seems to be plenty of battery charge.
I'll let you know what I find. Please if anyone else has heard anything let us know...this is getting REALLY annoying!!!