Sorry you feel that way. The team always try to balance working on all bugs and feature request (with a priority on fixing bugs/crashes). These most recent updates have all been to address crashes and audio issues (which IMO is more important than Automix and effects more people).
Also the Automix function is supposed to have track loading disabled by default (it is on PC/Mac and iOS), so the best practice would be to turn off automix before you attempt to load a new track.
for both the PC/Mac and iOS versions of Cross DJ, loading a track is disabled when playing an automix playlist. This isn't as much of an issue for those versions since you can load tracks into the playlist instead, but I assume it is supposed to be disabled in the Android version as well and since it isn't that might be what is causing this rapid fire crossfade bug.
Sorry for the inconvenience,
Adam @Mixvibes