Since you checked and found no paper jam, please try performing a reset of the printer. While the printer is on, unplug the power cord from the printer. While the power is off, press the power button 5 times. After 60 seconds plug the power cord back in and power on the printer.
If the issue persists, I recommend reaching out to Canon support for this issue. You will need to register your Canon gear HERE to access additional support options.
We look forward to hearing from you.
Did you ever get this fixed? I had the same problem with a particular paper (Pictorico Pro High Gloss) with the Pro-300 I bought in May 2022. Canon replaced that printer with another one which has the same problem! (My old pro-10 handled this paper without a problem)
09/26/2023: New firmware updates are available.
08/18/2023: Canon EOS R5 C training series is released.
07/31/2023: New firmware updates are available.
05/31/2023: New firmware updates are available.
05/18/2023: New firmware updates are available.
03/30/2023: New firmware updates are available.