Using two extruders on a long Bowden tube one assisting the other…
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You can probably get your router to always assign the same IP address to the DuetWifi. Have a look at your router manual, it's often called a DHCP reservation.
Manual IP address setting is on the firmware wishlist.
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I'm surprised that the IP address keeps changing. I've had 3 Duet WiFi boards on my network, and my router always assigns them the same addresses. I think most routers work this way, they remember the last several MAC addresses that connected to them so that they can give then the same IP address when they reappear.