I looked into your crash report a little further as I would consider this a critical issue.
There were errors coming from the database in regard to restoring some data from the database, however I do not believe these to be the cause of the crash (perhaps a symptom of the crashing)
Closer analysis of your trace files shows in situations where the application terminated unexpectedly, there was some relevant information contained in the trace file:
2016-10-18 06:55:26:703 The requested operation cannot be performed on a file with a user-mapped section open.
You will want to exclude the NinjaTrader 8 documents folder from any other utilities that may be scanning folders. Here is another thread on that error which contains some information that may be helpful:
If you still experience crashes, please contract our support team so we can look into this deeper. Resetting the database likely would not fix the core issue, and we would want to determine what it is that is locking files that prevent us from saving information as you use NinjaTrader throughout the day.
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