I have a CM500 and I'd say sometime around January I started getting these very strange spikes in connection. Sometimes they last for a few seconds, sometimes they last for a few minutes. I never FULLY disconnect from the internet and I've had multiple tech guys come out here and one of them said that it could potentially be something to do with the outside cables. Today I had the most recent tech out here and he told me the cables all look good on the outside and it could potentially just be the modem or router since the cables look fine. This issue has been driving me INSANE so if anyone has any clue what could be causing it I would appreciate it SO much. I just placed an order for a new modem which will be the CM700 but I really don't think it's the modem causing the issues but it's what Comcast told me. If someone could figure this out for me I would be EXTREMELY grateful.
This is a picture of a website I use to monitor my connection when I see it spiking, it's very basic but it lets me know when it happens. The picture shown here is the time when my connection is spiking. This next picture shows when my connection is fine right after a spike and sometimes stays stable for awhile before spiking again. I also made sure to ping Comcasts IP using CMD to check the times and during a spike it very clearly shows spikes of up to 200+ms responses.
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Greetings, @Tropial! I appreciate you taking the time to reach out to us here on the forums. I hope you are having an amazing day! I apologize to hear of the issues you are having with your internet connection. I know how important it is to have a reliable connection these days. I work from home myself and rely heavily on my internet connection. I would like to see what we can do for you. Since you already sent a PM, I will continue to assist you through there.