I know for sure it happens to my wired ports because those are what I'm using. I think it happens to the wireless too but I'm not positive. I seriously doubt it's an isp connection problem since the lights on the modem never show anything abnormal.
The disconnects are just little hiccups that last a few seconds or less, but it's enough to make me have to reconnect to whatever game I'm playing.
Currently trillian is how I'm tracking all these disconnects, they happen whether the computer is sitting idle overnight or whether I'm playing a game, doesn't matter.
Hope that's enough info for ya, help me out.