Network printers get randomly and continuously disconnected after macOS 11.2.3 update

Hi Fiod3s,

This additional information has been helpful.

In that case, we'd recommend the following additional steps:

1. Make sure all devices are on the same network (2.4GHz or 5GHz).
2. Confirm printers are still compatible: About AirPrint
3. Restart all connected devices in this order; router, printer, and any connected Macs or iOS devices.
4. Test printing: You could create a note in the Notes app or print something specific.

Note: If you're using a mesh network, remove all satellite routers and use the main router only.

If the issue remains, then you'd want to Contact Apple Support

Wishing you the best, cheers.

Hello fiod3s,

Thank you for using Apple Support Communities. Based on your post, you've had issues keeping your printers accessible after upgrading to Big Sur. We'll do our best to assist with this.

Depending on how you re-added the printer, you may need to get an updated software driver for your printer: Update printer software on Mac

Make sure the network is set up to use Apple devices and servers: Recommended settings for Wi-Fi routers and access points

Check for interference: Resolve Wi-Fi and Bluetooth issues caused by wireless interference

If you've tested the above, then we'd recommend rebooting the network, then the printers. Should it continue, then you'd want to contact the printer manufacturers for further support.

Hoping this helps out, take care!

fiod3s,

Thanks for keeping us updated.

We're happy to hear that you were able to isolate this issue and get it resolved.

Have a great rest of your day!