What does this mean?
lots of FDO errors https://community.esri.com/search.jspa?q=FDO+error
but none with that number... you will have to elaborate
yeah, I have seen "fdoError Constants" list (like this http://resources.esri.com/help/9.3/ArcGISEngine/ArcObjects/esriGeoDatabase/fdoError.htm), unfortunately This one is even undocumented...
What's the backend storage? SQLite by chance?
Have you run into problems with SQLite databases? If, so can you describe them?