I think problem related to DNS Servers. Have you use DNS Servers on your Macs as per your Windows PCs? As per my information DNS Servers are usually set in System Preferences. It is Network on your Macs. When you next time get this error, juts do following.
Open the Terminal and copy/paste the following commands?
Code:
host google.com
dig google.com
ping -c 3 72.13.207.99
ping -c 3 64.232.187.99
ping -c 3 64.232.167.99
ping -c 3 google.com
traceroute 72.14.207.99
echo "done"
Now save entire transcript of commands and post here. So that we can get more information.
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