Asterisk freezed

Dear all,

i’m experiencing a strange with Asterisk version 11.24.1.
Sometimes happens that Asterisk freeze. When i connect to the CLI i can’t see nothing and calls are not working.
I can’t write any command on the CLI.

When i reboot the service, everything starts working properly again.

What can be the issue?

i have checked the full log and i can’t any error, only two minutes before the last log i found NOTICE[10744] pbx_dundi.c: Max retries exceeded to host ‘’ msg 0 on call 18170


Update: in both the cases this issue has happened the last log is : app_dial.c: – Nobody picked up in 60000 ms