My Canon Pixma 620 suddenly stopped being recognized by my iMac

For the past year I have had no problems printing with my wireless printer.  But as of just two days ago I am no longer able to print.
Each time I try to print to my Canon Pixma MP620 printer I get a  popup that says The printer is not connected, under which there is a  grey moving line, beneath which it says Printing - the printer is  offline.
When  this first happened I decided to delete and reinstall the printer from my computer, and I reinstalled the driver. The reinstallation worked perfectly and I don't think there is anything wrong with the printer itself. However, when I  tried to print again I had the same problem.
I  have an iMac OSX 10.8.5. As I mentioned, this only started happening  suddenly about two days ago; before that there was never a problem.
Does  anyone have any idea what I can do to have my computer and printer  communicate again? Do you think there is an update that happened  behind-the-scenes that messed this up? Any other suggestions?
Thank you.

Try resetting the printing system http://support.apple.com/kb/ht1341

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