You can switch on an environment variable to generate crash logs on captured exceptions (from memory they are binary so no use) but this only works very rarely in my experience. Best course of action is to log this problem with support. Unfortunately there are a lot of problems with Fusion randomly crashing and they do not seem to pay any attention to this forum.
It is really important that everyone who has any problems/questions/requests log them through support, if they go unanswered it should raise a red flag (Support KPI's, managers start getting some heat) and then BM may finally do something about them.