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Re: These connection problems..
Have you tried connecting directly to the modem to see if this still happens?
Troubleshoot via process of elimination, always the best policy if you can do it.
If you can't best thing I can suggest is that you check your router out. In theory the cable modem shouldn't care whether you're browsing or pinging websites. Don't power them both down next time, try just rebooting the router + see if that resolves it. If it does that points again at the router.
I don't think it's a proxy related issue either, however you may wanna try the proxy forum for the instructions on how to change proxies. What I suggest is that you specify a proxy in IE and leave Firefox as it is, then if FF messes up see if IE isn't working either. If IE also isn't working then that eliminates the proxies as a potential cause and leaves only the cable modem / the ntl network, assuming you've done all the steps I've detailed. If that's the case call tech support.
Try the above. Should tell you where the issue is.
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