Does this seem as though it must be a GoDaddy issue?
Don't know. I've given a lot of suggestions, and asked questions about your router/modem setup, but you haven't replied to them, or mentioned if you have tried what I suggested.
What exactly is your hardware set up. Router, modem type, any hubs/switches. The first thing I would try is connecting straight to the modem from one computer, but that also depends on if the modem is also the router.
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