No, it's a normal procedure when you hit the limit you have set, that the crawlers go down in numbers to match your setting for max allowed download.
Here's a couple of things you can do at first, i have to sleep so just a short post.
Choose uk as your preferred country, this will spare you data to crawl, the nearer to your country the better.
You will then see that more workers can work, as your download is from near, you are not using so much bandwitch.........
I'll be back tomorrow, sorry... to tired zzzzzzzzzz
But yes, there are things you can do, and don't blame your router.
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