What could change the settings on our network?

I have a little network populated by two printers, a NAS and 3 CPU's (two Macs and a Laptop running XP).
Recently the laptop started misbehaving and while it is better now it still is a little odd. However, this question concerns something I discovered along the way and I doubt that the laptop is a player here.
The IP settings are fairly typical. IP is 192.168.0.X Subnet mask is 255.255.255.0 Most items are DHCP but I keep the NAS and one printer at fixed addresses so I can reliably address their web based GUI's via a browser pointed to http://192.168.0.200 for example. The router/modem is at 192.168.0.1.
Here is the oddity: One recent day I found that the printer and the NAS had changed their IP addresses to 192.168.1.200. How did that 3rd octet switch from 0 to 1? I did not do this. Can network citizens change their addresses, jumping out of the LAN?
Bob V

Some IAPs do provide a fixed IP address, but many change them periodically: this doesn't affect your normal use as the change is usually seamless: it's done to stop you running a web server (and thus using a lot more bandwidth).
However the OP isn't in fact dealing with IP numbers issued by his ISP. He has a router, which is being issued with an IP number by his ISP, but which is issuing its own numbers to his local network. Numbers starting 192 are only ever issued by local equipment, and thus are invisible from the internet side of the router they have to be, since thousands of people are using the same 192... numbers).
Since he has set his printer etc. to fixed IP numbers they should stay the same, though obviously the computers, which are using DHCP, may change from time to time. If they are changing it's a matter with the router: it has nothing whatever to do with his ISP.

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