Temperature keeps dropping and takes too long to heat back up ,constantly and taking product longer to cook

If your oven temperature keeps dropping and takes too long to heat back up, it could indicate a problem with your oven's heating system. Here are a few things you can check:

1. Check the oven's heating elements: If one of the heating elements in your oven is faulty, it may cause the oven temperature to drop. Turn off the oven, unplug it, and visually inspect the heating elements. If you see any signs of damage, such as cracks or breaks, the element may need to be replaced.
2. Check the oven's thermostat: A faulty thermostat can also cause your oven to drop in temperature. You can use an oven thermometer to test the accuracy of your oven's thermostat. Simply place the thermometer inside the oven, set the oven to a specific temperature, and wait for it to heat up. Check the thermometer to see if it matches the oven's temperature setting. If it doesn't, the thermostat may need to be replaced.
3. Check the oven's door seal: A damaged or worn door seal can cause heat to escape from the oven, which can result in a drop in temperature. Inspect the door seal for any cracks, breaks, or other damage. If you notice any issues, replace the seal.
4. Check the oven's control board: If the above steps do not resolve the issue, it could be a problem with the oven's control board. Consult a professional technician to diagnose and repair the issue.