So that the Community can help you better, we need to know exactly which Canon printer model you're using. That, and any other details you'd like to give will help the Community better understand your issue!
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If you have a sporadic connection between the printer and computer, you can try relocating the printer so it is closer to your router. You can also, try unplugging the router from the power for 5 seconds and then plugging it back in. Once the network is back up, you can check if the computer can add the printer. If you are still unable to add the printer, you can check the printer's ip address using the steps in the link found HERE to see if it has changed.
If you continue to have issues, I would suggest contacting support at 1-800-652-2666. Our agents would be happy to assist.
This printer supports wi-fi or ethernet.
I suggest you assign or set a static IP for it on your router or gateway. This will ensure it won't change and/or you will always be able to "find' or reach it.
Once done, uninstall it from your PC or MAC. Now reinstall it as a IP printer, using the IP you assigned it above. Moving forward, the IP will not change, you will always be able to connect to it, and print from any device connected to the same network, regardless of when it was last used, turned off / back on, etc.
Support page for your device:
Bay Area - CA
~R5 C (184.108.40.206) ~RF Trinity, ~RF 100~400, +Canon Control Ring~6D2 (v1.1.1) Retiring ~EF Trinity, others ~DxO PhotoLab Elite ~Windows10/11 Pro ~EVGA RTX 3080Ti FTW3 Ultra ~ImageClass MF644Cdw ~Pixel6 ~CarePaks Are Worth It