Since installing 8.1 and using with my 2012 Sync, it has been having issues too. Now when I get in my vehicle I have to keep trying to content 3 to 6 times before it will connect. Then once it connects if I try to play audio, it's very choppy for a few minutes. Meaning, it starts and stops, starts and stops... then finally it will start and keep playing. All of this is without human intervention. I have a 2011 version of sync from Ford. They do not offer any updates, their site indicates I have the most recent version.