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windows - Slow internet connection for no reason

We have a cable internet connection. I've called the company when this happens and they say there's been no downtime on the modem and the signal is strong and there's no fixing or outages in the area. I mostly trust them on that.



Cable modem -> 4 port gigabit Netgear switch -> Sonicwall -> Cisco 2960S -> Dell T410 DC running Server 2008R2 with basic settings




Currently have about 50-75 connected computers or servers.



Internet is great for a week or two, but then (at random) it gets really slow for about half an hour. Then back to normal speed.



What would cause this out of the gear listed? Is there a tool for figuring this out?

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