C8 hub was accidentally powered down and now the LED stays blue

My switch is unmanaged, my router is Google Nest. So no set up in either on.
arp -a could only find a few devices. Found a free network scanner to download Advanced IP Scanner - Download Free Network Scanner. That found all the devices and their MAC address. Found that the hub is now on 10.0.2.23.
So I did a soft reboot and restored the db from my nightly backup.
Not sure how the IP address changed. I should set it fixed at the current address.
Thanks to both of you for helping me
Need some help with setting a DHCP IP address reservation.