Hello erdostamasa,
I would recommend setting up the wifi again, and if there is a setting to select Static IP, make sure that is checked.
I set up my Xerox Phaser 3020 yesterday with no problems, I printed a couple of test pages over the wifi network. Today I tried to connect to the wifi/print something but it's unreachable. The printer is turned on, I was able to print the Information pages. No changes has been made since yesterday.
When I scan my local network I see this:
Dead XRX9C934ECC2487 192.168.0.199 Xerox Corporation 9C:93:4E:CC:24:87
Yesterday when I entered the ip address I could connect, today: "This site can’t be reached 192.168.0.199 took too long to respond."