Currently Being ModeratedMay 2, 2013 7:00 AM (in response to ThomAnthony)
I would reccomend that you check out this article. It specifies that it's for Snow Leopard and Lion, but the troubleshooting is still applicable in Mountian Lion
There's a section near the bottom titled "Symptom: The network connection drops unexpectedly." That may have some pertinent information for you. If that doesn't solve your issue then you may want to contact Apple support following the link below.