So your LAN IP is changing and so is the password?
If that is the case, have you checked with your ISP to see if they are pushing out some kind of update to the router that would make these changes?
Also, if there is an option to disable the admin acess from the WAN/internet side make sure you do that.
Lastly, if there is wireless, either disable it or enable encryption, preferably WPA2.
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