If you are using a cable modem or something similar disconect it to the internet until the lights begin to flash. Then connect it again. If it's roughly the same thing than me then it will reconnect to your provider and reconfigure itself.
Sometimes your provider may decide to change DNS or things like that. This is one way to solve this problem. Another way would be to call your provider to make sure your computer is configured with the right entries.
I don't have enough knowledge to talk about this with you in depth but I know those solution exist.
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