I have 90 megabit Comcast Internet at my house. It comes in via coax, and my PC is hardwired to the modem-router via Ethernet cable (not wi-fi). Roughly 15-20 times per hour (every few minutes), my Internet completely shuts off to my PC, for 2-5 seconds. Just a blip for a few seconds, but very disruptive in the middle of Remote Desktop sessions, heavy web development, etc.
Comcast acknowledges the problem. Somehow they're able to remotely detect that my connection drops repeatedly throughout the day. This has been happening for months. They say there are no outtages and that all my wiring and hardware is good. They have replaced my cable modem 4 times in the past month, yet the problem continues. It seems obvious the modem is not the problem.
The Ethernet from cable modem to computer is standard CAT-5 ethernet from Home Depot. I had no connection problems whatsoever for 4 years. These problems began 6 months ago when Comcast first "upgraded" my modem. So I assumed the modem was the problem, and as mentioned, I have been through 4 modems now.
3 different Comcast technicians have been out to the house in the past month. They all report strong signal and no hardware problems. They simply cannot find the problem. Yet the fact that Comcast can remotely see the dropped Internet inside my house suggests there really is a problem, and I certainly notice it a lot.
It's an Xfinity cable modem, very new, late model.
There must be some way to isolate the problem. Equipment? Software? Monitoring? Can anyone be a hero and suggest some way for me to figure out what's going on?