Well, it's probably not LW, because millions connect, search, and transfer all the time without the problem you describe.

I don't think it's your G5, or others would have reported the same.

Sadly, that leaves the Voyager (or the ISP?), and those are really hard to diagnose.

Have you asked your ISP what they think? Maybe you'll get a decent help desk person who won't just blow you off with some generic "it's not us it's you and your software" kind of comment.

If they would swap your Voyager, that would help rule out that maybe it's just a fluke.