See if you can document that your neighbors are having the same problems, if so then that will help confirm to the provider that it is not your own network. If there are any splitters in the line before the modem, try removing them and using a direct connection. I've seen poorly designed splitters cause signal degradation that leads to intermittent outages. Also try running a different modem, which may even help your connection speeds. For example, I wasn't having any connection problems, and I was using an older (vintage 2003) cable modem that conformed to DOCSIS 1.1 (Data Over Cable Service Interface Specification) http://www.cablemodem.com
. I had heard that Comcast had increased connection speeds in my area, however I wasn't seeing any benefits. On a hunch I replaced my older DOCSIS 1.1 modem with a newer one supporting DOCSIS 2.0, and my download speeds instantly *tripled*. In the next year or so I may want to replace it again, with an even newer DOCSIS 3.0 modem: http://www.dslreports.com/shownews/98582
If a new (known-good) modem with a direct connection doesn't work, then the problems most likely lie outside your network. I've seen cable and phone internet connection problems due to temperature, moisture, and even mice. Only the provider (cable company in your case) can fix problems that originate outside of your network. Call and complain every time it goes down (squeaky wheel gets the grease), and investigate other options if they can't solve the problem. For example, if DSL is available in your area, you could try that, or there may be a Wireless ISP option as well, which can be even faster than cable. Satellite is another option (one I used with great success for several years), however due to the cost and minor lag issues, I only recommend satellite if there are no other wired or wireless options. Let me know how it works out in the end, Scott.