I don't know. I punted and went to the Xfinity store and got a new modem. Solved part of the problem. But I had my house wired w/ ethernet cable. If I plug in ONLY my wife's computer to the modem, everything works fine, but if I plug in the ethernet cable that feeds the rest of the house (through various splitters, etc.) then the wifi connection on my laptop (WIN 10) and my daughter's laptop (MacBook Pro) (and sometimes our mobile phones - Android and iPhone) start connecting and dropping or just getting "connected, no internet". I no longer have a separate router hooked up, although I used to. I did purchase a Ubiquity WAP, but it has been disconnected since I started having this problem since I couldn't get it into bridge mode w/ the Xfinity modem.
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EDIT: just got a text from my wife who, after I remotely restarted the gateway, is no longer able to get an internet connection at all (wireless or wired). I hope Comcast is going to pay for the marriage counselor....
This has been going on for about the past 6 weeks, but keeps getting worse.
No recent changes in service other than whatever the new security service that got added (but it was pushed, I didn't do it).
The equipment shows as Technicolor CGM4140COM but it looks nothing like the graphic. The back of the modem shows X86-T. The bottom of the device has a PN of CGM4140COM. As far as I can tell it is compatible (it came from Comcast) and not at End of Life.
Devices exceed minimum requirements (except for the Win 8 computer, but that is seldom used).
I've reset the gateway over, and over, and over, and over, and over, and over again. Including a reset to factory specs w/ Comcast support activating it immediately afterward.
Lights on the front are fine.
I am not at home so I cannot test the signal strength. I would ask my wife, but she is desperately trying to work from home with what has become a wildly unreliable network.
Cabling and fasteners: nothing has changed (nothing added, nothing changed, nothing moved)
All the F connectors that I know of compression. They were all installed by Comcast.
All the splitters that I'm aware of were installed by Comcast. Last I checked, they were all fine.
Speed test last night (wired) was about 500Mbps (Gigabit speed). There is a Gigabit switch between one desktop and the modem. The other one is directly connected to the back of the modem -- this is the one that cannot connect properly today. (My cell phone could get connected to the network, but no internet was available - or the connection to the internet bounces up and down).
All security software is disabled on my phone (which, by the way, is working just fine on a Comcast wireless network at my office.)
Since I'm not home I cannot run a ping or tracert.
I will have to grab the logs and run a ping/tracert tonight when I get home. Assuming my wife doesn't strangle me when I walk in the door.
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EDIT: changed Subject to show that the wired connection instability is no longer occasional.
I posted this in response to someone else's issue but figured I should raise my own issue here since I am not able to chat w/ an Xfinity employee due to COVID19 work from home issues at Xfinity.
My WiFi connections frequently show that my devices (phones, tables, laptops) are "connected, but no internet". Gateway restart temporarily fixes the issue. Online diagnostic tool tells me that something is wrong that may be impacting my internet experience and offers to restart the gateway. This just keeps happening over and over and over again. Preventing me from working from home, which is less than ideal during a quarantine...
Wireless devices are 2 Android phones, 1 Android tablet, 2 iPhones, 2 Windows 10 laptops, 1 Windows 8 laptop, 1 MacBook pro (not all online at the same time.)
Hardwiring seems to reduce, but not eliminate, the issue.
I also get an occasional "cannot assign IP address" but that is far less frequent.
I have reset the X86-T to factory defaults and had Comcast activate it. No change.
Restarting the gateway appears to help for a time, then the issue comes back.
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Sorry, no tips. But I can commiserate. My WiFi connections frequently show that my devices (phones, tables, laptops) are "connected, but no internet". Gateway restart temporarily fixes the issue. Online diagnostic tool tells me that something is wrong that may be impacting my internet experience and offers to restart the gateway. This just keeps happening over and over and over again. Same thing or something different? Preventing me from working from home, which is less than ideal during a quarantine...
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