(Having been in the software business for 50 years), this is really beginning to sound like classic software issues. Dozens of possible inputs at the same time, in the aggregate a nearly infinite number of combinations possible. Which combination kills the camera . . . sometimes??
Good luck, Nikon! You will need a hell of a lot of software talent, and time, and determination to dig these things out and fix them. And if you don't have the commitment, and won't provide the budget, well, they may never get fixed.
It appears that DSLRs are now computers to which huge sensors and camera bodies are attached as appendages.
It would be interesting to know how many million lines of code this camera has, and how many megabytes of executable.