For the past few years, my internet has been having random disconnects during the warmer months. I've had techs come out to my house at least 10 times over the past years and have been told that it is a variety of different things, always on my side. At this point, I have replaced my modem and router, ran a new line from the outside box directly to my modem and replaced the connectors on both ends of the coax line a number of times. Further, there are no splitters on the line and I checked to make sure that the system is properly grounded to my home's grounding rod next to the box. Each time a tech comes out they replace a couple of things and say there is nothing wrong because they don't see anything wrong with the signal levels / tests that they do or they guess that it is the modem and swap it out for a different one. I am posting here at this point because I need someone to inspect the lines outside my house as I have replaced every possible thing it could be within the home.
Specifically what happens is that when I restart my modem everything is fine. Over time, the power levels on a couple of the upstream channels creep up until there is a Dynamic Range Window violation and the internet cuts out. After a minute or two, the connection turns back on again and the cycle repeats. This happens multiple times per hour throughout the day but normally stops after it gets dark (sometimes there are still issues but the vast majority of problems are from around 10:00 am to 6:00 or 7:00 pm). Further, I typically do not have issues in the winter. It always seems to start in Spring and continue until late Fall.
I would attach a screenshot of the signal levels but right now they're fine and I can't get into it because I have to write this while tethered to my phone ....
The upstream power levels are normally 41-42 on all four channels and then one spikes up to 53+ and it discos.
Downstream is between 3.8 and 4.5 on all channels with SNR of right around 42 with lots of Correctable and Uncorrectable code words across all channels.
2 of the downstream channels are wierd though, 1 has 0 power and is not connected and then another has a near infinite amount of correctables and a power level that is lower than the other 32 channels.
The Event log shows numerous T3 timeouts and occasional T4 timeouts with tons of Dynamic Window Range violation errors at the times when internet disconnects.
If someone that cares from Comcast could please reply I would appreciate it. We are almost never home at times when appointments can be scheduled so it is almost impossible for me to be here when a tech can come out. Please just have someone inspect the stuff outside - it has to be an issue out there at this point.
Yep. The stats were o/k at that snapshot in time. This can't be fixed remotely or here in this forum. It takes a "boots on the ground intervention". Perhaps you should get the techs re-involved until it is fixed properly. Bear in mind that if the premises facing techs can not find or fix a problem at your home, it is they who are responsible for escalating it to their line / network / maintenance dept. techs. The problem may lie beyond your home in the local neighborhood infrastructure somewhere but it is their S.O.P. to start at the home. Good luck !