S4Mk3 and Z2 deck lock and couldn't load tracks on deck and unloaded track playing in CUE (all channlels) and there's no way to control it nor stop it. Had to restart midset. And lately crashes.
Traktor 3 is not supported. Use Traktor 4. 😎
Are you talking about the bug where you can't load a track, even though the deck is stopped? That bug still happens in TP4 and no one really knows why it pops up.