I know that sometimes stepping away from your research for a while, though it may take time to reorient yourself to your notes, is a good idea because getting too sure of your theories may actually prevent you from having some new tactics.
When you IGNORE documents because you've decided too soon that they are not valuable to your research ...
When you believe without question what a family member or other informant has told you about people, places, or the loss of documents ...
You may have a case of GENEALOGICAL MYPOPIA !