Lose connection to Internet when uploading a file.

I'm using a Xircom Twin-Wan router connected to a T-1 line and a Charter cable line. Whenever I upload a PDF to my website, I lose internet connection and have to power cycle the router. This is a repeatable, reproduceable problem, and it's weird!

Aside from this, everything is great and has been working great for over a year.
elmoredanielAsked:
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IanThCommented:
has your router got its latest software installed
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elmoredanielAuthor Commented:
I can't get the router to display it's firmware version, so I installed the latest firmware available reguardless. I'll see if I can reproduce the problem now.
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elmoredanielAuthor Commented:
Ok, no the problem still exists.

We recently upgraded our domain server to windows 2003, that is the only thing that has changed for this office configuration, which has worked for years.

Thoughts?
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elmoredanielAuthor Commented:
The problem was found to be a flakey T1 line.
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