DECO P7 changes LAN ip settings to 192.168.0.1 All is fine for many weeks but when my ISP provider has problems or there is a poweroutage then the LAN IP on my DECO changes from 192.168.1.1 to 192.168

I installed my Archer C9 router on January 20, 2019 and it worked fine for over a year then it started dropping the internet access. I would have to turn my Archer C9 router and my modem (Netgear MR11