I have a 2014 Sonata Hybrid and I updated to 8.0.2 last night and my BT is totally messed up. If I make a call it initiates on the car bluetooth but after 7 seconds (every time 7 seconds) it kicks out the call to iPhone. The call is still active but it's on the phone.
I was thinking it was my iPhone because I just switched from a Space Grey I6 to a Gold I6... but I think it's 8.0.2 because 8.0 worked fine on my Space Grey.
I'm still on 8.0.0 ugh this is driving me nuts. I am having the same problems as you.