NETGEAR is aware of a growing number of phone and online scams. To learn how to stay safe click here.
Forum Discussion
CM1150v Intermittent Slowness and Channels not locking
Hello, Having an issue where the CM1150v modem I have went from perfectly fine to all of a sudden flashing the downstream light repeatedly. My speeds went from 300+ to about 20-30mbps. It's been ...
Was this resolved for you? I am having the same exact problems you describe here except I don't believe our signal is being split before the modem connection. We also used to have Comcasts all-in-one modem/router before we switched over to this new setup. When we had that there was intermittent service from them but it wasn't as frequently down as it is now. Before I'd have to call in to Comcast to have the signal resent maybe every 2 weeks.
Were using Google mesh system as a router. We have 3 of those. For the first 2 weeks the whole system was up and running and we had the fastest internet I've ever experienced. Now same problem you are having, intermittent service or no service at all. I have to have Comcast resend the signal every day now.
Same exact thing you describe above. The Comcast tech comes out. Everything checks out. They leave and something goes down a few hours later. Yesterday the tech left and for the first time my main phone line went down but we had internet. Usually its the internet that goes down after they leave. I wake up this morning and no internet. Restart the CM1150v and now internet is back but very slow. I've had a Comcast tech out 3 times in the past 2 weeks.
I'm not an expert but I don't think the CM1150v is playing well here. It appears other people are having the same problem. If this is a Comcast "recommended" modem why can't Netgear or Comcast figure this one out? We're wasting our time troubleshooting. This is so frustrating. I work from home so this is costing me money every day.
suspen wrote:Was this resolved for you? I am having the same exact problems you describe here except I don't believe our signal is being split before the modem connection. We also used to have Comcasts all-in-one modem/router before we switched over to this new setup. When we had that there was intermittent service from them but it wasn't as frequently down as it is now. Before I'd have to call in to Comcast to have the signal resent maybe every 2 weeks.
Were using Google mesh system as a router. We have 3 of those. For the first 2 weeks the whole system was up and running and we had the fastest internet I've ever experienced. Now same problem you are having, intermittent service or no service at all. I have to have Comcast resend the signal every day now.
Same exact thing you describe above. The Comcast tech comes out. Everything checks out. They leave and something goes down a few hours later. Yesterday the tech left and for the first time my main phone line went down but we had internet. Usually its the internet that goes down after they leave. I wake up this morning and no internet. Restart the CM1150v and now internet is back but very slow. I've had a Comcast tech out 3 times in the past 2 weeks.
I'm not an expert but I don't think the CM1150v is playing well here. It appears other people are having the same problem. If this is a Comcast "recommended" modem why can't Netgear or Comcast figure this one out? We're wasting our time troubleshooting. This is so frustrating. I work from home so this is costing me money every day.
We're more than willing to help you troubleshoot but you need to start your own thread. We try to focus on a single person's problem to keep things from being confusing as well as each situation is unique and requires different details/approach. Again, please start your own thread so we can help you.
When you start it list:
Modem speeds you pay for
Speeds you get hardwired
Screen snip of your modem connections page
router and firmware
What exactly is happening. Not just signal drops. Do wireless and hardwired, what fixes it, what is your wiring layout, etc. The more details the better.
- Same problem here with a CM1100 and Comcast. 2.01.02 firmware. No signal splitter. My 250 Mbps connection drops to about 30 Mbps until I reboot the modem.
Have you had the ISP check the signal and line quality up to the modem?
Might contact NG support and have them review any debug logs from when this happens.
coldcaffeine wrote:
Same problem here with a CM1100 and Comcast. 2.01.02 firmware. No signal splitter. My 250 Mbps connection drops to about 30 Mbps until I reboot the modem.Haven't had a chance to try the modem directly on the line that comes into the house (in the attic), but that still would be completely unreasonable to not be able to have internet service and TV service at the same time -- a splitter is neccessary to provide this and has worked for years, including months with this modem. (And they just replaced this piece when there for this service call) It just happened all of a sudden 2 weeks ago that the downstream light started flashing and speeds dropping. Not sure if firmware related or Comcast line related or what. They tested all the lines all the way up to the modem. It's just so itermittent that I don't know how to tell anyone from Comcast how to see it since it's working for a day, then not for a day or working for a morning, then not at night. It's completely random.
This is still happening to me, the downstream light flashes and the speeds drop. The light stops flashing and the speeds go right back up.
I'll try to report back after I have a chance to test it on the line coming into the house when the problem is occuring.
:smileywink:
