Intermittent dropout of internet connection using cable modem

Hello all.
My connection drops out a few times a day. Only for a few seconds, but I suspect it caused problems with downloading a playlist from iTunes today, which is particularly frustrating; and it's unnerving at the best of times. My ISP is not very helpful about this. I know that one possibility is that I'm getting interference from other signals, but I don't know what I can do about that, so I'm wondering if anyone has any suggestions about something I can do from the Mac.
To clarify:
The message I get from my email client (Entourage) is CONNECTION TO THE SERVER FAILED OR WAS DROPPED.
My modem is a D-Link, connected through an ethernet cable.
Here's hoping! Thanks in advance,
Roger

I think your problem is either the ISP or your modem. Try resetting the modem by shutting everything down; modem and Mac for two minutes. Then power up the modem, wait two minutes, then power up the Mac. If the problem persists have your ISP give you a new modem (if renting it from them) or purchase a new one.

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