Summary: This is my second mx512 with the exact same issue. Will not stay connected to my wireless network. It is located about 1 foot from my router so it's not a signal issue. My router is an ASUS RT-AC66U and all my other devices connect and stay connected rock solid! Going to put this thing on Craigs list and be done with it..
Conclusion: I was very proud of this purchase for the first 14 months of use. Then I had one paper jam which happened in the back and I had to open the back of the printer to extract the paper. And from then on, the alignment was off. I tried multiple auto corrects, and multiple manual corrects. Neither worked. SOOO FRUSTRATED, I could throw it off a cliff and feel much better.
Summary: First off the design of this printer is nice, it looks like a piece of art, too bad it's a piece of junk... The cons: this is the second Canon I've owned in two years, Canon printers tend to permanently clog if you don't use them for a couple of weeks and there is no way to clean them if they get to a certain point. The size of the printer is huge because of it's cool design but at the same time it takes up alot of room because of it.
Summary: Programs that will print in black & white only have a problem with this printer. The printer default is color. I have Presto Forms and it will not work with this printer because the program scans and prints in black & white. Canon cannot advise me how to change the defaults to black and whit.
Conclusion: I bought this printer to replace a previous Canon I had for 8 years. I've had three issues with it. 1. Paper falls on the floor, even when the tray is extended. Very poor engineering design. 2. There is a huge lag when printing wirelessly. The dialog box to the computer says Printer not responding, and then it prints about 5 - 10 seconds later. 3. In the copy mode, it is very slow. I try to set it to the Fast Mode, and it won't accept the Fast Mode.
Cons: Slow Print Speed, unreliable, long lag with wireless printing