A users newly installed network jack in their office has intermittent connectivity problems. Upon tracing the network cable back to the punch down block, the network technician determines that the length is 180 feet (55 meters). The network cable also passes by several open power junction boxes. The cable tests as continuous across all wires and is punched down correctly. Which of the following is the MOST likely cause of the intermittent connectivity problems?

A.
EMI

B.
TXRX reversed

C.
DB loss

D.
Faulty network card