On my way home tonight I fired up the iphone podcast player and experienced multiple instances of audio lag when listening to an hour long podcast. The audio would just cut out for a quarter of a second then come back in. So this is no longer a Spotify issue.
I ran a master reset on my car
Next I ran the reboot app
Re-paired my phone
No immediate audio lag/skipping yet. I'll see how this works again tomorrow morning when I have another 30 minute window of testing. I really want this to be a fluke. 3.5 works great otherwise.