Profile named boundaries broken

Hi 

The profile named boundaries occasionally get "broken" without any apparent reason.  The profile group in the named boundaries manager becomes empty but the group is in the "other groups". That makes the profile annotation drawings and sheets useless ie We need to cut and annotate them again -30 of them. Is there a reason for that and a fix? Or maybe a better workflow. For instance keeping named boundaries in separate files? We keep the drawings and sheets separate from design model file. But the named boundaries are in the design model.