I have a fairly new 3com 3crwdr101a-75 router which regularly has intermittent connection issues to various sites I frequent. - geekzone.co.nz, throng.co.nz, clientsection.com, nzherald.co.nz to name a few.  This doesn't normally happen at the same time - unless the sites are on the same server/ip address.  The site having the issue returns a Network Timeout error.  I can still successfully visit other sites, use IM, SSH, FTP etc

I have tried using another modem and don't experience the same problem so I'm fairly convinced it's something to do with the modem.  I did have it setup for OpenDNS but changed it back to Slingshot to see if that was the problem but it made no difference.

There are 3 PC's and a Mac that connect to the router and all experience the same problem.

Anyone have any suggestions as to what the issue/solution might be?

Cheers