There are many reasons why ceramic baking dishes may crack. One of the most common reasons is that the dish is not heated evenly. This can cause the dish to heat up too quickly on one side, which will cause it to crack. Another reason why ceramic dishes may crack is if they are heated too much. If the dish is heated beyond its capacity, it may crack from the intense heat. Finally, if a dish is subjected to sudden changes in temperature, it may also crack. For example, if a cold dish is placed into a hot oven, it may crack from the sudden change in temperature.