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ok. got that minimal session .qtz and the from the screencast you sent I could see that the crashes happens after a few dozen of bus switches and on my test it seems to be more probable when the audio meters are opted-in for the MIDI tracks plugin-chain.
I'll try to investigate and come to a better fix than telling you to turn-off the MIDI tracks audio-meters.
thank you for all your patience
cheers

[UPDATE 1:] found some old potential crap in the Track > Track Properties... dialog, wrt. changing current output bus on the fly: might be related to the crashes you report (as seen on the screencast you sent or maybe only partially mitigated (qtractor >= 0.9.9.81git.a90be8); please test and tell whether the odds are lower ;) tia.

[UPDATE 2:] make it qtractor >= 0.9.9.83git.ed8f41 !