I couldn't see a M5512cdw, but I can see a M5521cdw: Product Support & Downloads | Kyocera (kyoceradocumentsolutions.co.uk)
I would put the printer on a static IP high up in the range, e.g. 192.168.1.201, mask 255.255.255.0, default gateway your router, DNS your router
It needs to be high up in...