I have faced same issue with my netgear router, when I got the setupwizard then I easily set up to that IP address but suddenly the router changesthe IP address. So anyone can tell me the reason of suddenly changes the IPaddress. I didn’t install the hard drive on netgear router then I resolved thisissue from this link https://www.netgearroutersupportnumber.com/
A Few days ago, I have faced the same issue with my Netgear router, when I go to the setup wizard then I easily set up but after some time the router changes the IP address suddenly. I resolve this issue with the help of this link: https://www.gethumanhelp.com/netgear-customer-support/