About: http://webisa.webdatacommons.org/73182823

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	I would start with the 'easy' non invasive test see if your system is heavily loaded for some reason.
http://www.w3.org/ns/prov#wasQuotedFrom	superuser.com