Repeating Internet Outages throughout the day

What do the modem's signal stats look like ? Try getting them here http://192.168.100.1 or here http://10.0.0.1

Please post the *Downstream Power Level*, the *Upstream Power Level*, and the *SNR* (Signal to Noise Ratio) numbers.

What is the exact make and model number of the modem ?

Is this a WiFi connection ?

Cable Modem

Upstream

I do have the wifi enabled, but only at 2.4 GHz.  I also have a wifi router attached.  However, I have the same issues regardless of whether the wifi router is on or off.  I have had two different wifi routers, and get the same issues with both them.  I have tried running without both of them and still have the same issues.

If it's any help, this issue started immediately after there was a wide area Comcast outage.  When Comcast reported that the outage was over and all services restored, I didn't have internet.  After being told to repower my modem, I got my internet back.  But, the outages started the next day. 

And if it's any help, I have been keeping logs of when the internet outages occur. 

The upstream power is high and it may be intermittently fluctuating even higher to out of spec levels. That can cause random disconnects, spontaneous re-booting of the modem, speed, packet loss, and latency problems.

In a self troubleshooting effort to try to obtain better connectivity / more wiggle room, check to see if there are there any excess/unneeded coax cable splitters in the line leading to the modem that can be eliminated/re-configured. Any splitters that remain should be high quality and cable rated for 5-1002 MHz, bi-directional, and no gold colored garbage types like GE, RadioShack, RCA, Philips, Leviton, Magnavox, and Rocketfish from big box stores like Home Depot, Lowes, Target, Wal-Mart etc. Splitters should be swapped with known to be good / new ones to test

If there aren't any unneeded splitters that can be eliminated and if your coax wiring setup can't be reconfigured so that there is a single two way splitter connected directly off of the drop from the street/pole with one port feeding the modem and the other port feeding the rest of the house/equipment with additional splits as needed, and you've checked all the wiring and fittings for integrity and tightness and refresh them by taking them apart then check for and clean off any corrosion / oxidation on the center wire and put them back together again, then perhaps it's best to book a tech visit to investigate and correct.

130 dB is typically the inter-port isolation rating, not the loss rating.

Based on your recommendations, I replaced the cable running from the modem to the wall and ensured all connections were good and tight.  I then replaced the first splitter on my incoming cable.  This first splitter had the coax for the cable modem and two other outputs.  After replacing the splitter, I only reconnected the modem.  Nothing else on the whole cable line except for the modem.   After taking thes two actions, the upstream power levels actually went up slightly.  Unfortunately, within an hour, I experienced another internet outage. 

However, it occured to me that since these outages first began immediately after a wide area outage. I should check my outside cable drop. My cable drop is also the hub for the street and connects everyone else on my street (I am the first house on the street).  In the past when there have been area outages, the techs have worked on my outdoor drop/hub.  Wondering if all these outage issues could be related to work that was done on my outside box when that widespread outage occured - maybe there was a loose connection there - I slid the cover off my drop and I found that the cable was bent at an extreme right angle, crimping the cable where the drop from my house was connected to the hub.  It looked like the hub had been pushed over closer to the cover and when the cover was slid back on, it bent/crimped the cable.  I pushed the hub back towads the middle, straightened out the cable, and very carefully placed the cover back on.

I am still getting the same upstream power levels as I did earlier that day.  However, it has now been 4 days since making that change and there has been no outages at all.  I have never made it more than 48 hours without the outages starting again.  I am hoping that this simple effort fixed the problem. 

Thanks for offering up the potential solutions to lead me to examine this and try this solution.  I would like to keep this open for a while longer just to ensure that I don't start experiencing outages again.

So ... went one week without any internet outages.  Thought the problem was fixed.  Then had one on Sunday, one on Monday, one on Tuesday, none on Wednesday, one on Thursday, but three so far today. 

This weekend I will try connecting the modem straight to the incoming cable with nothing else at all on it ... no splitters, etc.  I will look to see what the power levels are coming straight from the drop and will report on that. 

O/k. Post back !

So after being lulled into a sense that all was well when my internet seemed to be functioning normally for about two weeks, the outages began again. This seemed to accompany a notification from Xfinity that my bandwidth speed was being increased.  The outages were initially anywhere from one to three minutes and they occured several times a day.  Within the last week, the routine of multiple outages a day that run from 10 to 45 minutes, or worse, that completely shut down my system requiring multiple manual restarts. 

The theory that my power levels were too high doesn't seem viable.  For the two weeks that the system worked with no problems, I had the same power levels.  Now that the outages are back, the power levels are actually a little lower than they were when I had no issues.

The continued issues again are significantly impacting my business and educational work that I need to do at home.  I will try again this weekend to connect the modem directly to the incoming cable with no other outlets attached (the modem is on the first splitter already, but I will remove all other cables) just to ensure that power levels don't change.

Link to the conversation about the original outage issue:

https://forums.xfinity.com/t5/Your-Home-Network/Repeating-Internet-Outages-throughout-the-day/m-p/3269696#M309289

Please post the latest signal stat figures.

Internet went out today (11/10/19) at about 12:23.  Here is the upstream power stats after it went out but before reset.

It came back up for about a minute  after a full manual reset that included unplugging both the power and the cable from the modem and then went back out again at 12:44 pm.

After this reset, all lights came on for modem – and it showed online – but there was still no internet coming through.  The 5 Ghz light continued to blink off and on (although the 5 GHz is disabled on this modem so not sure why that was blinking).  The Xfinity online app showed modem was not connected and when conducting troubleshooting, it stated that the modem was unresponsive

Immediately after a restart was attempted through the Xfinity app, the modem "online" and "Tel1" lights went out.

After a second manual restart (like above) was conducted, the internet came back.  Below are the upstream power stats after that restart.

A short while later, the internet went out agina.  After a full manual physical reboot like above (had to conduct twice), it came back up with the below upstream power stats.

Very brief intermittent outage, but it came back up by itself.

It was still functioning at 3:30 pm

O/k so now there is only one upstream channel locked and it is on the high side. An upstream / return path impairment would cause high power and the un-bonding of channels. Perhaps it would be best for you to now get a tech out to investigate. Good luck with it !