If your oven door is not closing properly, the issue could be worn hinges and door gaskets, or possibly the door is slightly out of alignment. Hinges and gaskets allow the door to seal tightly against the oven frame. If anything is worn out or shifted, the door will leak out heat and will not seal the cooking chamber properly.
When an oven door won’t close all the way, hot air escapes when baking or roasting. If hot air continuously escapes, the oven may not heat up to the desired temperature, and the food may cook unevenly. Losing hot air makes the oven work harder to reach and maintain the set temperature and may even increase the baking time.
If you've checked the obvious issues with your oven and the problem persists, it may be time to get professional oven repair services. The oven probably has a technical issue, like hinge problems or alignment issues, and having professional appliance repair servicescan get your oven to function reliably and safely again.