Router IP addressed changed but I didn't change it!?!

The weirdest thing happened, and I was hoping someone could offer an explanation.  I have a WRT54G router and 2 desktop and 1 laptop computer all setup wirelessly to it.  I am the only one in the house that is familiar at all with how the computer network is set up and noone else knows how to access the Router Setup (I don't they even know it exists!).  And even if for some reason they found out there is one, there is definitely no way anyone could know my username and password.  Anyway, I tried to log into the Router Setup and got a page could not be displayed message.  Then I checked to make sure I am connected to the right wireless network (didn't want to accidently connect to a neighbour's unsecure network) and yes, I am connected to mine - I can tell by the name.  So then I checked my default gateway IP just to make sure it looked ok, and discovered that the IP address is now 192.168.2.1 instead of 192.168.1.1!  When I try to log into the setup using this IP, it gives me a login screen, but won't authenticate me.  Has anyone every heard of this??  I know I can reset the router to factory defaults in order to log back in, but I'm wondering if anyone has ever heard of this before.  Any insight would be appreciated.  Thanks!

Your setup seems good. So it is hard to tell what caused the problem. There is a certain chance that some hardware malfunction caused a couple of bits in the RAM to flip. Maybe it got the LAN IP address and some part of the password.
If you really want to check whether someone's broken into you would have to monitor the LAN and the activity (e.g. check the lights and use a network sniffer). Certainly it may be a couple of days until whoever-was-it does something. So, I suppose the best option would be a fresh start from a reset if you are not able to connect to the router's setup anymore.
Changing the LAN IP address of the router won't make it harder to find the router or its IP address. The DHCP server will quickly tell... Thus you have to turn the DHCP server off as well. But still there are so many broadcasts on your LAN that anyone who would gain access to your network would quickly know the IP address. Thus, anyone who would be capable to break into a WPA secured wireless network would have no problem with the different gateway address...

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