Why does the movie flash automatically flash?

Actually, there is another situation. If you change the voltage at home, such as turning on the air conditioner and turning off the air conditioner, the voltage change may also flash.

You can try to plug the flash and the hair dryer into the same plug-in, and then change the power supply of the hair dryer, and the flash will discharge. It's actually a protective discharge.

Besides, why not unplug the flash? It's very unsafe. Flash lamp is an explosive device for storing electricity, and it is quite dangerous if it collides and causes leakage. I suggest you unplug the flash as long as you use it.