I may have posted this question a while ago - I can't remember. I use Opera web browser. Many times during the day my computer freezes up when I try to open any web site. (5 year old Lenovo S400 Idea pad; Windows 8.) After about 30-40 seconds, I get a message on the screen: "Your connection was interrupted. A network change was detected." But I have never changed anything. I uninstalled/reinstalled Opera twice but that didn't help. Does anyone have any suggestions. Thank you very much.