I, too, had repeated connectivity problems with Comcast that lasted for about two months, but then the problem disappeared. I was finally told by a technician that came to the house, they were here several times, that Comcast had had problems with new equipment being installed in their nodes. Apparently, the "new" equipment was eventually replaced with the "old" equipment...grin. If you have a drop line to your house for the computer, i.e., a line running from a utility pole as opposed to an underground line, ask Comcast to replace the line, which they should do for no charge. It could be that the line is defective or the connectors are bad. Have you tried rebooting the modem when these connectivity problems occur? By that I mean you should unplug both the electrical line and the co-ax cable for the modem, reboot your computer and then reconnect the modem. Sometimes that helps. I'm not sure what procedure you follow when these problems occur, but the next time it happens leave your computer "as is" and then call tech support. Be sure to ask if the Comcast system boards are showing any red lights or other indications that there are problems on the cable network. Ask for the ID number for your call, every call is assigned one. Keep a log of the ID numbers, the date/time you called and the date/time the problem occurred. Jon Raymond St Paul Park, MN Web site: http://freepages.genealogy.rootsweb.com/~raymond/