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Hi, I'm new here. Hopefully someone here can diagnose my problem better than the three Comcast Techs that have been out to my home.

My problem is not speed, its stability. The error my Modem shows in its log is something to the effect of "T3 Timeout - No ranging response received." Whats odd about this is how random it is, it will go some days without a single error/disconnect/hitch, others it will be constant outages every 3-5 minutes for 30-60 seconds (Something to note is that it can be off-and-on for weeks at a time, or be solid for weeks at a time).

Another thing that is odd is how the modem reacts. Sometimes it will show the error, but pick up again right away, other times the modem will reset itself without any input from me (Frustrating because I lose the logs every time). Either way, when a disconnect does happen I am unable to access the modem's Information page until it regains connectivity, or finishes resetting.

Like I said, I've had 3 tech guys out to my house. The first guy replaced the line from my house to the street, which accomplished nothing. The second guy, after checking my signals, decided it was something on the street and said he would have their Street Techs look at it (I'm unaware if anything ever came of this, as my net's performance never changed). The third tech, who was here just yesterday, determined that it was a problem of noise in the lines and put some noise filters on my modem and on some of the older lines in the back of my house.

I wish I had more information to give you. My connection doesn't go through a router, my modem is connected directly to the outside line (except for the filter the 3rd guy put on it), and my computer connects directly to the modem with an Ethernet cable. I've tried manually power cycling the modem, and resetting through its software. As far as I can tell my signals are fine (I cant really see them when the net goes out because the modem software freezes up until it regains connectivity). I'm not super experienced with this stuff, but I'm tired of trying to play any sort of game online and getting owned by my connection, so any and all comments are welcome. Thanks.

Wow this is pretty sad... What state are you in?  Like disturbed said ask that a field supervisor come out and bring a new modem just for kicks.  Of all of the Comcast tech that have been out o my houseit normally only took 2 maybe 3 times before everything was better for my signal issue.  I am really shocked that the entire new line from the curb didnt fix the problem. 

Thanks for quick replies!

I live in Washington State, the city of Kirkland to be specific (Just slightly north of Seattle).

I talked with Comcast again today. They're sending one last tech out tomorrow before they send the supervisor, the guy on the phone thought it sounded like a problem with something on the street, but wanted to try and have a tech see the problem in action. Hopefully it will be off and on when he gets here (knowing my luck it will be totally smooth and it will be another useless venture).

I'll be sure to suggest they try switching around the modems. I use my own modem (Surfboard SB5120) that has been through good weeks just the same as bad, so I don't understand how that could cause it, but I'll try anything at this point.

Heres an update:

Had a tech over once more, problem wasn't occurring while he was here unfortunately. However, he left a really long cable for me to experiment with. Basicly I waited until the problem started happening again, and then plugged the long cable DIRECTLY into the street line (no splitters, no TVs, no cables in the walls, just roof > modem). The problem continued even with this direct setup.

Obviously I'm going to be talking with them again. Is there anything specific you guys can think of that I should say or ask for?

I just went through the same thing with Comcast.  Called the night it started and the Tech on line saw that I had a Node gone bad and that they were working it.  He told me that 60 of 69 people on the node had already called in.  There was no other info beyond that.  No estimated time of repair or even what was wrong other than node issues.

I call the next day and they told me there was no problem and it was on my end.  They continued to tell me that my signal way good.  You could not get them to understand that it was a connectivity issue and that they were having partial node issues.  I kept loosing sync every 3-5 minutes.

Called again the next day and after the fox went around the rabbit hole several times I asked for a manager.  Instead I got a Sr Tech and he again insisted that it was on my end.  I explained that I'm a Work Group Manager and I had brought my tools home and from the box to my house was perfect.  I caved and told him to send a tech then.  The Tech said I had the best line and signal he has ever seen and could not see any problems.  Then I showed him my logs from broadbandreports line monitoring I had been doing.  32% availability for 7 days then it went to 56% then to 72% and dropped to 21%.  Then he followed me to the front of my neighborhood and I showed him the node.  I wounder why the node cover was gone and the ground was freshly dug up.  He called in and after 10 min he said that I did have a partial node connectivity issue and they had no idea how long it would take to fix.

I e-mailed my spreedsheets and got three months credit due to the trouble and no one knowing anything.  Don't let them talk you in a circle.  Monitor it yourself, log and track it and send them the proof.  I guess they fixed it tonight, my speeds are back up and running.  Good Luck

yea for some strange reason my max DL was at at 4.4Mbps and im on a 6 meg line, and no Powerboost at all. Had 2 techs come and test the line and they say it has a good signal. So i put on a new modem gave them the new mac address and still wont go past 4.4Mbps. Basically im tired of Crapcast ! As soon as Fios gets to Chicago im switching ASAP! And im gonna call them again to see if I can get them to check the node box at the end of the block.