About: http://webisa.webdatacommons.org/101140895

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	Those can get frozen or the tube can get dirty and cause all kinds of problems, some of which your describing.
http://www.w3.org/ns/prov#wasQuotedFrom	powerstroke.org