Coiled up high-speed fiber optic cables suffer data-abrasion due to centrifugal forces. Either reduce data speed or arrange those cables in straight lines with space-grade angle connectors.
If you ever experience this, but can't uncoil the transmission cables, a workaround is to spin your desk chair in the opposite direction of data flow, at about the speed of light (for the respective cable medium). This temporary cancels out the effects of ethernet frame looping induced dizziness. Alternatively, you can treat any sickness symptomatically by chewing on a piece of ginger. The latter also helps with aforementioned data-abrasion in fiber optic cables through means not fully understood, yet.