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
Summary: I have had this printer 4 months now and am considering returning it. Sometimes it pulls in too much paper and when it doesn't it sure sounds like something is wrong. Wireless is awesome when it works, but sometime it won't show up on iPad. To fix you have to 'wake it up' and try again.