I had this printer before and everything worked fine. My girlfriend took the printer, bought one just like it, and this problem started. My router works great...is there settings that I need to change? I did give the printer its own IP address to hope and fix it. Its DEFINITLY the printer causing the issues.
Something to try: Set a static IP on your printer to something like 192.168.X.3, then you will need to log into your Router and change it's starting IP number to 192.168.X.4 so you can be sure it won't try to assign the printer's static IP if it is offline for any reason. X= whatever octet your router uses.