At the time, our technician just changed the RFID board and that fixed it. Coincidentally enough, I'm having the same issue 5 years later. I changed the ink bay PCB, reset cables, and changed out all ethernet cables to no avail. I haven't swapped RFID boards yet because the problem happens periodically with both White and Cyan, which is both RFID boards, leading me to believe that isn't the source, unless they both just so happened to fail at the same time. Thinking it's another linked component like data relay.