About: http://webisa.webdatacommons.org/322938904

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	That information would lead me to believe there is an issue with your USB data lines. 16.2MHz is almost 2% tolerance, the AVR-USB automatic calibration is supposed to get within 1%.
http://www.w3.org/ns/prov#wasQuotedFrom	macetech.com