Please reproduce your issue (make it happen again), then create Sysdiagnose file, as described in the article below:
How To Save Sysdiagnose And System.Log In Mac
Please also attach volume dump file, as described here:
How To Gather Volume Dump File In Mac
Then send the created files to Support Team. Make sure to provide detailed step-by-step description of the issue you’re encountering. Specify the names of files you’re trying to work with.