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upobDaPlaya

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How do I troubleshoot erractic Comcast Internet Speeds

In the past year I have averaged 28 mbps with Comcast High Speed Internet.  Recently the service has been unpredictable..Per speedtest.net one minute I get a download speed of 28 and if I try the speed test 5 minutes later it is 3 mbps.  It has been so erratic at times I can not work on the computer connected to Comcast and am forced to use a T-Mobile Hotspot.  Note I have tried multiple computeres wired into the modem with the same speed results.

My setup is a:
Cable Modem
A PC directly wired via ethernet into the cable modem

Comcast has said they have done everything over the phone they can do and will send a tech out over the weekend.  My fear is they are going to immediately blame it on the cable modem and tell me to buy a new one without researching my issue.  How do I prepare for the tech coming out so I can avoid the "go get a new modem" response.

Note the modem is only a few months old.  It is a DCP3008 CISCO Cable modem.  The Cable connection comes into the house at the basement and then is connected to a splitter.  Once branch comes upstairs to my cable TV which is fine and the other branch from the splitter comes upstairs and connects to my cable modem.

Note I will go downstairs tomorrow with the modem and connect the income signal from outside into the modem and see if that makes a difference....so far I only checked downstairs that the splitter connections were fine.  It was all put in 6 months ago and it looks tight.

Do they sell anything at a MicroCenter in terms of a tool where I could test the speed outside of the modem ?
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Scott Fell
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upobDaPlaya

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Comcast was out today...They did some type of upgrade that hosed a lot of people for a weeks according to the tech.  My signal seems to be back now on a consistent basis..