Problems with starting boot.py and main.py for STM32F407ZGT6

[ChenYujia66]

I would like to ask, my board uses the STM32F407ZGT6 firmware, why sometimes it loads very slowly when the board starts, and even after loading, boot.py and main.py are not run. It is on the internal flash memory. After loading, my file still exists, but I don't run it anymore. These two files are placed on the file system. But after two or three days, this problem will not appear. It does not persist. I have changed the power supply on the board. Is it related to the boot program? What parameters do you need me to provide?