When openmv4 h7 plus is busy ,and the connect is broken,why?

my openmv disk has 30.1MB free space and my main.py is about 50kb.
this morning my code always happens busy , print data in ide have not been showed anymore,the ide says the openmv is busy,and soon ,the connect is broken.
why?
win11+openmv ide 4.5.2:
Traceback (most recent call last):
OpenMV v4.5.2-dirty; MicroPython v1.20-omv-r22-dirty; OPENMV4P-STM32H743
Type “help()” for more information.

Hi, the firmware version you are using is very old. I can’t say why.