The magnetic switch in the center of the cooker is called the Thermal Magnetic Switch, an important part of the cooker. It is called Thermal Magnetic Switch because it is a button that works with heat and magnetism.
The device contains a small magnet, which can weaken over time. Then there is the problem of falling before eating. You can then restore the checkpoint to its original state. However, the new products are imported from China, so they are often new but bad.
Some are so bad that 8 out of 10 are bad. This means that even if you add a new one, the button will fall off before the meal. Made in Thailand, good quality.