IPC-HDW5231R-Z IP address constantly changing

This just happened to one of my camera from last night. Haven't touched it since putting it up years ago - sounds like I have to take it down to attempt a factory reset, else replace it with a spare on hand. Found this thread by searching 192.168.1.251.
 
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i'm here 3 and a half years later having this exact issue! the camera served me well for many years. it's in a remote location in harsh conditions, so it will time to address it in person. i cannot easily swap the vlan to get to it at 192.168.1.251 because of remote access IP overlap.
 
See below. They also can become stuck at that point. Maybe @TheWaterbug can provide more.

It turns out that it's a known behavior of some Amcrest/Dahua/Lorex cameras to boot up and send out traffic from 192.168.1.251 before they request a DHCP address. Then they request DHCP and go back to where they're supposed to be.