Welcome to the HP Support Forums! I see by your post that you no longer have the A3 paper size, after a Windows Update. I would like to help you out today. If this helps you to reach a solution, please click the "Accept as Solution" button down below in this message. If you wish, to say thanks for my effort to help, click the " Thumbs Up " to give me a Kudos.
Most likely the Windows Update changed the print driver.
Once the printer is working is working properly again, the option would be to ignore the printer software updates or you can try these external resources, that have some advanced steps. This information was provided by my co-worker @midnight-anwrs.
One poster tried the Show or hide updates and it resolved their issue.