I was having the same BT issue where it wouldn't turn on. I went through all sorts of methods to fix it and finally got it working ... been working perfect ever since. Off the top of my head, I can't recall what it was that I did, but I'll think on it and try to repost my solution. If I'm not mistaken, it was a 3rd party app that was causing the issue, but I'm not 100% on that.
Do you happen to have a banking app installed? I know that when .83 came out, the banking apps quit working and I did a work-around to fix it. I believe that was the issue. I uninstalled my fix and the banking apps. I've since reinstalled them and used Motorola's certificate installer. BT still works well.