Hey, I pretty much registered just to reply to this thread since I was having an SBG6580 nightmare of my own and it looks like it's finally solved now that a new line (temporary) was run above ground from the green box across the street to my house.
Background:
My old DOCSIS 2 SB5101 was working fine and it wasn't until "upgrading" to the SBG6580 and going to the Blast! plan that I started to have trouble.
I was getting the same events in my event log you guys were getting (unrecognized OID, lots of docsDevResetNow resets, etc.) since I installed the new modem and things finally came to a boil this past Friday when the modem reset 10-12 times in about 6 hours, and I was getting 10,000 "correctables" per second on QAM256 downstream channel 4. After a week of complaining and attempting to fix this problem in a variety of other ways (including a modem swap), I finally got a tech out to look at the connection leading up to my house, which he found was cut, and replaced with a temporary extension running across the street.
To Comcast's credit:
* Most of the techs I talked to on the phone were on their game and were helpful, knowledgeable, and sympathetic.
* After things got really bad, I was only about 36 hours away from a tech coming out to look at physical signaling problems, and he came out on a Sunday (today).
* My problems were intermittent, and while I was getting 10,000 errors per second all Friday night, by late Saturday this had subsided to 100-1000 errors per second, without any equipment/cable changes -- so I understand why it wasn't easy to pinpoint where the problem was.
Things Comcast should work on:
* By Friday night I had already talked to Comcast 4 times during the week. Early in the week (Mon? Tue?) a tech noted my SNR and power levels on all downstream channels was out of whack -- in the "yellow" -- and that if I had ongoing issues after swapping modems, they would definitely send someone out to look at my physical lines. Maybe I should have complained a bit more during the week, but I've been a Comcast customer forever, and it probably would have been a lot less expensive and aggravating for both me and Comcast if they just sent a guy in a van by during the week to peek at my signal coming in to the house for 15 minutes, since there was an obvious issue with my signal.
* My firmware was "automatically" upgraded to 3.3 from 3.1 after I complained for the 4th time on Friday. Maybe there is an automated firmware upgrade process SOMEWHERE, but I was literally watching my event log and firmware revision level while talking to the tech on Friday night and watched it reset and upgrade to 3.3. It was pretty clear what happened, but subsequent Comcast techs insisted that the upgrade process was automatic, and there was nothing they could do to upgrade or downgrade the firmware. That was a bit infuriating because I saw it upgrade while talking to a tech and THINGS GOT WORSE after 3.3 and I WANTED TO GO BACK TO 3.1 AT THE TIME.
* After 3.3, instead of just having intermittent signal issues, the modem reset itself (I presume to try to solve the signal issue). This made my situation worse, because instead of a download or streaming video pausing for 5-10 seconds, it would pause for 30+ seconds while the modem rebooted, and things were no better after the boot.
* After 3.3, something changed with WMM (wifi multimedia). I was getting 35mbps on speedtest.net through wifi on my laptop pre 3.3, and after 3.3 I was only getting 0.5mpbs. After disabling WMM, my speedtest.net immediately jumped to 27mbps on wifi, and remains at 35mbps on wired. I'm not gonna complain much about 8mbps on wifi when most of my PCs are wired and still getting full throughput, but something definitely changed for the worse with 3.3. I asked at least 6 times if something could be wrong with my config that made my laptop throughput go from 35mbps to 0.5mbps after 3.3 and each time, I was essentially told politely that someone's coming out to look at the physical problem on Sunday and they think that's where my issues are.
Bottom line, mine was a physical signalling issue that only became apparent after going to DOCSIS 3. The firmware 3.3 upgrade may have resolved issues I didn't know I was having, but it caused at least 2 issues I *did* know I was having (more frequent reboots and WMM issues). A little more honesty about the firmware 3.3 upgrade process as well as some knowledge on how to roll back to 3.1 would have served Comcast well here... along with simply sending someone out early in the week when you could see my SNR and power levels were off.
Hopefully nobody trips over or breaks my temporary extension cord to the internet as it is running a solid 50 feet above ground and across the street until they can get a crew out here to run a permanent below ground solution.
