HI. Thanks for that. I should have been more specific. This is what happens: I press print and see that the computer is connected, the data are sent, it says it's printing and there is activity on the printer screen suggestive of the printing function, but then it just all goes away. It just stops. So I"m unable to print anything. It's really strange.
Any further ideas?
If the printer is working sporadically, there's likely one of two issues at play.
If things sit in the print queue for a while, and then print all at once, then the printer has been set (or reset) on the computer to use the default drivers that come preinstalled. Remove the printer from your Printers list, remove the driver from the All Programs or All Apps list (if they are present), and then reinstall the printer using the Canon-produced driver. Canon-produced drivers for the MG7520 are available, free of charge, at https://ij.start.canon.
If the printer often reports as "unable to communicate" on the computer, check the printer's signal strength and distance from the wifi router or modem. Ensure the printer is at least 2 ft away, and that the wifi signal strength on the printer reports as 70% or higher. Printing the MG7520 Network Settings page. If the problem persists even after confirming the above, then ensure the computer is not switching to a 5 GHz connection, and that the security software on the computer isn't blocking communication between the printer and computer.
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