hostname issue

[Adam Weremczuk <adamw@matrixscience.com>]

Hi all,

Today when I logged into my Debian 9.2 VM I noticed that the hostname 
has changed to the first block of the IP address I was accessing this VM 
from last:

root@83:~#

"hostname" command was returning the full IP address 83.xxx.xxx.xxx

Cat /etc/hostname was still showing the correct name.

After apt-get update, ap-get upgrade (to 9.3) and reboot things went 
back to normal.

Is it a known bug?

Has anybody seen anything like this before?

Thanks
Adam