OS X updates?
Saying that, yeah Bluetooth does silly things. I have no issues with my phone connecting in my 08 Audi S3 but randomly it will just disconnect whilst on a call. Then reconnect 10 seconds later. Only once every few weeks. Oh and sometimes the hang up button on wheel fails to hang up the call so I have to leave an awkward voice message whilst I scramble to find my phone to hang up.
A few conversations with my passengers were unknowingly, awkwardly captured for posterity on people’s message banks.