There are a few reasons why your ceramic hob may keep turning off. One reason is that the hob may not be properly sealed. If the hob is not properly sealed, water or air can enter and cause the hob to turn off. Another reason is that the ceramic hob may have a low voltage rating. A low voltage rating means that it is not able to power your oven or stovetop. If your oven or stovetop does not work, you may need to replace the hob.