Asterisk Crash and want ask in Japanese

Hi, everyone.

I’m working to system with using Asterisk in Japan.
My system had a problem at last Friday.
Asterisk suddenly crashed when I doing calling-test normally.
I want to know why did it happen.
but I can’t explain correctly in English.
so I want to know an Asterisk developer who can speak Japanese so I can ask in Japanese.

Thanks your help.