So far, today's fix has been working well. No disconnects, no real problems.
Keep in mind, I'm using Beta 13, so it might be different.
There are also some significant improvements to ApplePlay, in Beta 13. It seems to me, that the "little right side screen" on our infotainment center, is now somewhat obsolete and they haven't yet figured out what to do with it. The Main Screen will display Map (Waze) & Album art ... the right screen doesn't seem to display Album Art.
Also, one aggravation that I believe is Apple related, are Screen Shots. If you take a Screen shot of your phone, while connected to ApplyPlay, you also get part of the screen in your car. At least it now comes through as a separate file, so that's an improvement from the previous version.