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My PIXMA G5020 will no longer print double-sided. After sending a print job, the printer wakes up but then my Mac immediately displays a "printer is offline" message. I had double-sided set as a default and was experiencing this problem even with one...

I have a Pixma G5020 printer connected to our home wifi network, and typically print from a Mac. About a month ago the printer began having problems completing print jobs. This seemed to coincide with a firmware update (it's now on firmware version 1...