After numerous and repeated crashes of Traktor Pro 4 during a weekly gig I've downgraded to Traktor Pro 3, which is stable. Pro 4 is absolutely unusable in any real gig. Strangely, it works just fine at home, i.e., when not connected to the Kontrol S4 MK3.
The crashes go as follows (my member is supported by info from the Traktor Archive folder): (1) random time, about an hour or two into a gig; (2) playing a song, either Wav, or MP3, doesn't seem to matter, but a locally stored song; (3) suddenly the software stops responding to inputs from the S4, e.g., a browsing command or a loop command coming from the S4 [note: the software is dead at this point]; (4) audio cuts out completely within a minute; (5) the crash is so severe that Traktor cannot be closed [akin to a kernel panic].
Total garbage. A full refund of my money for the upgrade would not come close to recompensing me for this embarrassing hassle. I bought this Mac because I thought the crashes were the problem of using an older computer. In recent weeks is has been surprising when Traktor Pro 4 did not crash, which was a minority of the time.
Computer: MacBook Air M3 running Sonoma; Using Kontrol S4 MK 3.