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I don't have an answer for this but I disagree with the previous comment. I was having the same problem. For some dependencies, I was able to finish the download after several retries. It doesn't seem like a networking error on my end would cause these symptoms. I suspect that the mirror is overloaded. I had success on the remaining dependencies by switching to European mirrors. I tried going East from my location since it's now the middle of the night there.
Resolve your networking issues. If the downloads are failing/hanging, it's not anything inside Maven. When it downloads artifacts, it shows you the URLs being downloaded. You can use these URLs to troubleshoot your problems. Try them in a browser, from wget, or whatever.
wget