I think that I may have finally found the problem, and it isn't the computer, or the scanner - it's the cable modem. For some reason it 'hick ups' early on Tuesday mornings and needs to be reset. Fortunately, even my technology-challenged 80-year-old father can unplug and plug back in the modem to reset it. I'm going to give that a try; I'd like to keep the feed going. It's running for now but I expect it to go offline again Tuesday AM, so I'll call my father and ask him to reset the modem for me.