The problem is that the Creality printer controller is connected to the 5V supply in your wifi box, but there probably isn't enough power available to properly power the 3D printer (i.e. controller + heaters + motors). A simple solution is to cut the 5V wire in the USB cable. See my post: http://captainbodgit.blogspot.com/2021/05/3d-printer-isolating-usb-5volt-feed.html