Windows
- Open Printers & scanners → your printer → Open print queue.
- Untick Use Printer Offline / Pause Printing.
- Cancel all documents. If they stick, restart the Print Spooler from Services.
- Compare the printer’s IP (network config page) with the port in Printer properties → Ports.
- If the IP changed, add a new TCP/IP port or re-add the printer.
macOS
Remove the printer, confirm it’s reachable on Wi‑Fi, then add it again via IP or Bonjour/AirPrint. Reset the printing system only as a last resort.