Tool collision in rotary mode
I was playing with this same model few months earlier but I think I was able to download it as step file.
Crashes around head area are due to rotary axis being outside of model, this model is difficult for rotary tool path because head is tilted forward.
If you make a sketch line that passes thru entire model or get very close then use that line in setup as X axis orientation you would minimize the problem.
As you see in the screenshot, most problems are where rotary axis is exposed, tool is confused between cutting model and circling around axis.
Accepted solution
It helps but it is not core of the problem or complete solution, it's been proven in other threads that rotary axis outside model is the culprit for odd tool behavior. The reason is that tool attempts to rotate around X axis and cut model at the same time resulting in wide loops and unpredictable motions that may or may not manifest as crashes.
Run attached file and look at what happens as tool encounters area where rotational axis in outside of model.
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