Why does the phone sometimes cause the computer to sleep when placed on the computer keyboard?

Do you feel a sudden suction every time you close the computer cover? The Macbook Pro has built-in magnets and sensors on the screen frame and under the palm drag. As long as the sensor senses that the upper and lower cover magnets are attracted together, it will tell the system that it is time to sleep. We also know that every modern mobile phone has a speaker, and there are magnets in the speaker. When you put your phone on the palm of the computer, as long as the position is right, the magnet inside the phone will activate the sensor under the palm to make the computer think that the cover is closed. In fact, this trick can be done on many laptops and iPads, and sometimes it is quite fun...
I bought a matching case when I first used the air. When I usually use it, I like to take out the air and put it on the cover. After using it for a period of time, I found that every time the computer shakes a little, the screen will immediately go to sleep, because I have repaired the screen in Apple's after-sales service before, and my first thought is whether it is the consequence of the screen repair. As a result, after I went to the Apple store, the clerk explained to me after hearing my description that my case has a magnetic buckle, and after the notebook detects the magnetism, it will think that you have buckled the screen, and the screen will naturally go to sleep . At the time I felt like an idiot...