I am not aware that anybody has researched this professionally.
The Ontrack report, with categories like "get-home-itis" and "over reliance on GPS" is the one attempt I know about but is nearly useless.
One thing is certain: so long as people do dead reckoning / visual nav only there will be busts, at about the present level, and nothing can be done about this. This is because GA pilot currency is not that great; the national average is somewhere in the region of 10-20hrs/year and at that level the man is only just hanging in there in terms of cockpit workload. You get away with it in familiar territory (and that is exactly what many pilots do) but sometimes not when going further afield.