Automix is shuffling a large playlist, but jumping wildly between tempos.
Master tempo range is set to 8%, but Automix is routinely mixing between 25%+/- songs.
It is staying in somewhat close keys though.
Also, if you change the Automix>Settings>Tempo Adjust from Sync + Tempo Blend to just Sync, the songs will be held at the sample BPM when transitioning between songs instead of automatically adjusting the Tempo up or down to the incoming song BPM.