Power failure and sshd_config

[Guest]

[teicors]

Hi all,
I manually changed my sshd_config in order to remove the root user from the "AllowUser" to increase my security
Today I had a power failure caused by a thunderstorm and when I tryied to logon I found that the sshd_config has been reverted to the "out of the box" configuration. :O
Can someone explain me if is there any security reason for this behavior or I have to modify the sshd_scheleton or this is how the efw works ?

cheers and thanks !!!