issues with Arduinno based web sever

I have a Ferduino controller and am having an issue with the board picking and choosing its own IP address one time this the next time something else an I am not sure what would cause this issue. it seems to be voltage related but again I don't know why.

I have a Ferduino controller and am having an issue with the board picking and choosing its own IP address one time this the next time something else an I am not sure what would cause this issue.

Why doesn't the router assign the address, and the Arduino use a static address to match?

it seems to be voltage related

Based on what evidence?