I don't know how you're connecting to CarPlay, but I'm doing it wireless and it seems to me it just take a bit to boot up and if that's the case not sure it can be sped up. Not sure what you mean by buggy, I haven't had that.
What I mean is that it’s extremely slow and sluggish when it first boots. Calls don’t work and people say they can’t make out what I’m saying until it’s been running for a few minutes. I’ve never experienced this in any other car.