The Detect Outlier operator that didn't stop...

My problem is that all the operators work flawlessly through normalization. However, when I run detect outliers for about 13.5K records, the process does not stop and just continues as if it was in a loop. I am using a distance-based approach where it implements a intuitive distance-based definitions for outliers. Has anyone had the same experience and been able to correct it? Thanks for your comments and recommendations.