Issue: Poor or intermittent connections can lead to signal loss or data transfer issues. Re-seat connectors and, if necessary, replace them., RJ45 for. Another source of problems in fiber optic systems is bends in the cable. Optical cables transmit data as light. Fibre optic cable repairs are crucial when dealing with physical damage, signal loss, and connector problems. A visual check is often the first step when diagnosing a defective. However, when these delicate fibers are bent, crushed, or exposed to harsh environments, the light signal weakens — resulting in high insertion loss, poor stability, or complete link failure.