WiFi has become so slow that it is not useable

[whiskytango]

Over a period of months WiFi with Comcast (Xfinity 100 Mbps service) has become so slow that I am composing this post using my phone as a tethered cellular data connection, and turned WiFi off.  Download speed is about 2 Mbps and upload speed is about 5 Mbps.  I have attached files of the modem logs.  Connecting the modem through an ethernet cable to the computer and turning off WiFi does not improve either speed.

My question: Is this a cable signal issue?  Several years ago Comcast replaced the coax between the green domed box outside and the box on the side of the house, but never buried the cable; they just put pine straw on top of it.  Over the years this cable has been exposed to the weight of parked cars and ridning lawnmowers etc.  

Any advice would be greatly appreciated.

[whiskytango · Accepted solution]

Update: The problem was the Comcast cable that was not buried properly.  New cable was installed today and I am now getting full 100 Mbps speed.

[whiskytango]

Here is the other file

[michaelkenward]

Try this in the section given over to your device.

Cable Modems & Routers

That is where users of the C7000 hang out.

I will ask the Netgear moderator to move your message.

[plemans]

holy cow. Your power levels are horrible. 

They're way way out of spec. and you have a ton of errors in your line. 

I'm impressed its even connecting at all. 

so check your line. remove any splitters, amplifiers, signal attenuators from the line. 

Check for kinks, damage, old/loose/bad/corroded connections and replace them if you have them. 

I usually tell people to move the modem to right where the coax enters the home and connect it there. 

this prevents wiring in the home being the issue. 

then get a screen snip of those figures again and check your speeds. 

If it doesn't help, the isp will need to check the line. 

[whiskytango]

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@plemans wrote:

holy cow. Your power levels are horrible. 

They're way way out of spec. and you have a ton of errors in your line. 

I'm impressed its even connecting at all. 

so check your line. remove any splitters, amplifiers, signal attenuators from the line. 

Check for kinks, damage, old/loose/bad/corroded connections and replace them if you have them. 

I usually tell people to move the modem to right where the coax enters the home and connect it there. 

this prevents wiring in the home being the issue. 

then get a screen snip of those figures again and check your speeds. 

If it doesn't help, the isp will need to check the line. 

Thanks @plemans !!!

I traced the coax from the output side of the box on the exterior wall of the house to the modem router.  Everything was tight and there were no obvious problems.  Comcast is going to inspect on 8/3/21, and I will update.

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[plemans]

Good luck!

did you try moving the modem to right where the coax comes into the home?

I've actually seen once where someone screwed a (to long) screw into a wall just perfect and hit a coax line in the wall. Was a challenge to figure out what was causing the issue. 

[whiskytango]

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@plemans wrote:

Good luck!

did you try moving the modem to right where the coax comes into the home?

I've actually seen once where someone screwed a (to long) screw into a wall just perfect and hit a coax line in the wall. Was a challenge to figure out what was causing the issue. 

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@plemans I did not have time to do that yesterday but will do that today.  The results will be provided to the Comcast tech to expedite his diagnostics.

[whiskytango · Accepted solution]

Update: The problem was the Comcast cable that was not buried properly.  New cable was installed today and I am now getting full 100 Mbps speed.

[plemans]

Glad to hear you got it working!

[isabellacharlot]

Cange the Comcast cable after that every thing will be fixed