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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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upobDaPlaya
Asked:
upobDaPlaya
1 Solution
 
Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
I have had good luck with comcast.  At one time, I had my own cable modem/router.  When I had issues, they tried everything and blamed it on the cable modem router.  They were right.

Another time they came out and checked my line.  Turned out somebody had recently added new service at the junction box and that took away my speed so they put in a new line and buried a cable and all was good.

It could be the splitter and good point to check the speed downstairs.
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upobDaPlayaAuthor Commented:
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..
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