Slow network? Reboot your modem!

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An odd one today. Over the past few days (week?) I've noticed that our cable Internet connection was a bit slower than usual, basically lots of latency and downloads running at 1/10th their usual speed which makes running a VPN connection a real pain. Calling tech support didn't get anywhere as they insist that you disconnect any router that you might have wired up and directly connect one computer to the line. I figured for SCOs and Googles (s'n'gs) that I'd try doing what they asked anyway. During the course of attempting to get my desktop to properly recognize the DHCP connection I power-cycled the cable modem probably three times and after doing so the connection suddenly was faster. To verify that the router wasn't at fault I didn't cycle its power at all, then reconnected it after the initial test and everything was working correctly again - cycling the power on the modem fixed the problem? I'm not sure why this would have happened, but it did and I'll remember it for the future.