When you say it connects via USB, I assume you are talking about the USB network adaptor that NTL sends out with it's packages. If so then I noted when installing this for a friend that the AEI network USB driver is not approved by Microsoft. I don't know if this would cause the crashes you are talking about, but this adaptor certainly caused some instability on my friends computer. I upgraded his connection to Ethernet recently & all is well. Perhaps upgrading to an internal NIC may help you too.