Do you have any plugins on those tracks? Is it happening all the times with the same plugins, or sporadically and not caused by a specific plugin?
There are actually more people having issues with Kontakt, there were quite some threads about that in the last months. You could try to use ProcDump64 to see if you’re able to create a DMP like that:
Also I wanted to let you both know @Tarquam @charliesun that there is a FR, which can ensure a more stable application in the future. Would be nice if you could support it by giving it a vote, if you think this is something Cubase should do as well:
Solution to crashes by plugins - Sandboxing (Crash protection) - Cubase - Steinberg Forums