Autopsy closes after ingestion


New user to Autopsy so excuse my line of questions. Ingesting a bunch of EWF files (e.g. E01, E02). Discovered the keyword module might give grief so excluded it.
All is going well and at some point I notice ingesting is at 85% and processing a vhd. Some time later, Autopsy is closed without any notification. Is this by design, or should I consider it a potential error?