If you are seeing performance issues when printing RFID labels, here are a few things to check on.
Cleaning Schedule and Procedures
https://docs.zebra.com/content/tcm/us/en/printers/industrial/zt610-zt620-industrial-printer-with-color-display-user-guide/c-zt4x1-routine-maintenance/c-zt4x1-cleaning-schedule-and-procedures.html
