Your position as a copyright of copyright is unaffected by the expiration of your copyright (PR) card, thus you are free to remain there. However, depending on where you live, some provincial services can need you to show a valid PR card.
You must renew your card before you depart if it has expired and you intend to travel outside of copyright. To return to copyright by commercial... https://skypodimmigration.com/pr_card_renewal.php