Sounds like a connectivity issue - this usually happens to me if my connection is being throttled or if I'm using all of my bandwidth. Are there any other devices connected to your router, wirelessly or otherwise? If something else on your network is hogging bandwidth this could happen - you can find out if this is the issue by connecting to your router's configuration page and changing your network password. Could also be caused by a weak wireless connection if you're connected wirelessly. Also, when you reset your router it's a good idea to disconnect the internet line for a good five minutes so that you'll be assigned a new IP address when you reconnect.
If none of that works, I'd call your ISP and have them run some diagnostics on your connection.
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