Massachusetts Comcast here and I have been having the same issue for the past 4 months. All I get is packet loss in every game I play, making them unplayable. Heres me pinging Youtube when it happens. This happens Every day, all the time. I have replace the cable and all connectors coming into the house, there is only the modem and TV on the line. There is something wrong with Comcasts network.
PingPlotter: It always starts at iboneNY and then escalates from there into a complete mess.
Actually, your packet loss problem starts much closer to home right between your modem and the Comcast system.
Post the requested info from here;
The upstream power is on too high / out of spec. And the downstream power is on the low / weak side. That can cause random disconnects, spontaneous re-booting of the modem, speed, latency and packet loss 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.
The spliiter outside has only my upstairs rental and my apartment on it. My connection is one solid piece of new coax cable off that splitter into my house with all new connections. The only thing off of this line is the modem and cable TV box with a spliiter that Comcast provided. I replaced all that due to this issue im having. The service worked great for 1.5-2 months, I dont know what happened.
Then it may be best to book a tech visit to investigate / correct the problem. That high upstream power shows that there is some type of upstream channel / return path impairment. 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 with it !
Im having the same Issue as you. My upstream is too high and my downstream too low. My internet is constantly experiencing packet loss making it unusable at times. I am also thinking about terminating my service if its a problem with their network. What good is "gigabit" speed if everything else is so bad.
Get a tech out. FWIW, posting additional stuff like the above is not going to help or fix the problem.