BB-xM doesn't stop service when rebooted

Hi all,
I'm continuing in setting up my BB xM.

I'm using Angstrom from Narcissus.

I have a strange problem while using ssh connection to my BB from my
linux PC.

This is the example:
1) I connect to my BB from my linux PC using SSH
2) I can use BB console without problem
3) I execute 'reboot' from remote console
4) the BB reboot
5) the ssh connection in my linux PC doesn't stop and it become

It seems like if dropbear isn't stopped before rebooting BB.

How can I check this?
I'm familiar with slackware linux but not very well with ubuntu or


When I reboot the board the output is: