the description of the error appears just too vague in my ears. due to "bad connection between a fiber optic cable that connects to the GPS receiver" seems unlikely, since it's first of all a very systematic error and secondly I can't fathom how a fiber optic cable can have a bad connection - at least not in this setting... unless they would've unintentionally bent the cable, resulting in a higher error rate in the transmission of the signal but shouldn't that show up in some network diagnostic tool?!