IPhone 5s no longer works with my JVC car stereo after upgrading

Hello!
I updated my iPhone 5s to ios8 last Wednesday (the 17th). When I drive, I synch my phone to my car stereo system (a JVC unit -- I can't recall the model number but it was installed just a year ago). After the upgrade, it worked fine. But on Sunday morning the phone experienced a hard crash and I had to reboot it by pressing the home and sleep buttons together. The phone came back without any further incident.
When I tried to make a call later that night I found that instead of my phone being active on my phone it tried to play music instead. I couldn't figure out how to stop this, so I turned off Blue Tooth. And now, when I try using the phone the Blue Tooth seems to synch up, but the phone cannot dial out -- I get a "called failed" message on the car stereo screen. If I look at the phone, I see that the phone has been activated, but it isn't dialing out. And then the phone will make bogus calls to an unrecognized number, or to a non-number. It will do this every 30 seconds or so. If I dial the phone manually, the Blue Tooth seems to work and I can talk to people hands free as usual. But when the call ends (and I don't always have a "call end" button showing on the JVC screen) the phone will again attempt to dial a bogus phone number.
The only thing that has changed is I upgraded my iPhone to ios8. Are there known issues around Blue Tooth connectivity? I also reset my phone to factory specs and reinstalled ios8 from my PC via the Lightning cable. This didn't change anything (I did that on Sunday evening). The Apple trouble shooting pages are of no help with this (I've already looked at them). I would really appreciate any help anyone could give me -- I think I've tried everything I know to do.
Thanks!

I upgraded to ios 8.0.2 and it still won't work. The phone will synch to the JVC blue tooth, but will not dial out. The phone is activated and it has the screen that indicates it is dialing but it isn't. And then the blue connection drops and won't reconnect.

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