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Strange "drops" on my home network.

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I have a home network that includes a 48 port fanned switch changed over to a 24 port fanless switch, a cablemodem with a built in router and 4 ports, a hardwired VOIP phone, and about 5 hardwired machines, 1 hardwired NAS, 3 hardwired game systems, 5 hardwired TVs and media streaming devices (stream from the NAS not over internet).

I have now had the cable people out 3 times and each time they are blaming the home network but I am perplexed on how to get rock solid "proof" that its not. You know, something I can put directly into their face and say NO WAY its internal issues.

Here is what is going on -

I lived in a house and before I moved I had 0 problems with my internet connection to my work. I had a VOIP phone and PC both on separate lines and they were always working fine.

Now in my new house I had the entire house head to toe wired in CAT6 wiring. The price difference between 5 and 6 was very negligible and I felt keeping it higher would help with anything coming in the future. I then had it all ran to a closet and I put in the originally 48 port LOUD switch. I then hooked up the router/cablemodem to it and I was rocking and rolling.

The one thing I am noticing is I am getting intermittent drops. What does this mean? My citrix RDP session to my work is dropping and disconnecting telling me its been dropped. I am having my VOIP phone where I can hear the person calling me but the person can't here anything I am saying. When I do speed tests I can see overall transfer speeds are great but I am seeing sharp "dips" in the graph for short period where its going from Megs to kbs and then back up again (usually 1-2 per speedtest no matter the server I pick which is whats making me suspect a "dropout" of some kind).

What I have done to troubleshoot?

I have ran a line directly to the back of the cablemodem for the VOIP phone with the same symptom occurring.
I have tried switching ports on the switches in case of any port problems.
I have Rreplaced the loud 48 port switch with a fanless 24 port that has made my house much less like an airport but has not changed the problem.
I have swapped out the VOIP phone and the power injector with no fix.
I have replaced the cable from the cablemodem to the switch. (Skeptical because it dropped on the phone being ran directly to the cablemodem/router).

What is perplexing me is I have access into the cablemodem and I am seeing no line errors in the diagnostics or any drops. But the other pert that is just as perplexing is I get the Citrix drops on my wireless laptop as well. What do you think is going on? How can I get something "rock solid" to take back to my cable company?

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