Question about Arris SB5100 SURFboard DOCSIS 2.0 Cable Modem (50120900100)

2 Answers

Modem disconnects on a daily basis

Every day, around 3-3:30 P.M. to about 4 P.M., my modem disconnects and drops the signal. Repeated power-cycling does not work, what could be the problem? I've had many altercations in the past with my ISP (Comcast) about this issue before and it was resolved for some time, until recently. In the past, I had a faulty modem, and my cabling was bad.

Posted by on

  • DeadmanWOS Apr 17, 2009

    everyday the cable modem (surf board) drops in the afternoon.

    the modem fails to reaquire the internet after

    i upgraded my cable service to include a motorola dvr

    dct 6416 lll. i have to unplug and plug back in the modem

    before it will connect to the internet

    if i want to keep my internet up i have to unplug the power to my dvr

    then the cable modem will not drop the internet


2 Answers

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert who has answered 20 questions.


    An expert that has over 10 points.


    An expert whose answer got voted for 2 times.

  • Expert
  • 83 Answers

Type in into your web browser, that should bring you into the modem, check on what your dB levels are.. Cut and paste your output in case this happens again. Your modem will have a log of the disconnects that you can use when talking to Comcast. It sounds like you might have a pwr problem with your dvr. Are they plugged into the same outlet? Are you able to contact Comcast while it is happening? As a workaround, try plugging each into a different outlet. I would open up a trouble ticket with Comcast and have them escalate the problem. If it is a comcast modem, they can bring you another one out.

Posted on May 08, 2009

  • Level 2:

    An expert who has achieved level 2 by getting 100 points


    An expert that got 5 achievements.


    An expert whose answer got voted for 20 times.


    An expert who has answered 20 questions.

  • Expert
  • 89 Answers

Its likely that the node you are connected to is simply overloaded. And a million people are getting online at that time, and Comcast just cant support everyone... For this there is no fix, Unless you switch to another ISP

Posted on May 25, 2009

1 Suggested Answer

  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%


Complete. Click "Add" to insert your video. Add



Related Questions:

1 Answer

The modem randomly drops the connection and restarts on it's own. Usually does this when there is a download or upload taking place while I am online or even when I am playing Xbox online. Why is this...

There can be any of a number of reasons for the modem randomly dropping your connection, but the vast majority of these are going to deal with a poor signal coming in over the coaxial cable line. Call your cable provider and let them know the modem is resetting. If they claim there are no problems, ask them for the signal strength and the "SNR". The signal strength should generally be within a ballpark of -10dbmv to 10dbmv, the closer to 0 the better. The SNR should not be any lower than around 32 or 33db.

Aug 18, 2011 | Arris SURFboard® SB5101 Cable Modem

1 Answer

Hi, I’m facing one issue with D-Link (DCM-202) Modem from last week. The internet connection frequently disconnecting with interval time less than 10 min. I have checked with service provider COM CAST...

Is this a new issue or a recent harware/cable change or did this use to work and now has the disconnect issues.

Ensure that your cable has NO Splitters (especialy outside) from the Drop outside to your modem.

Check all cableing between Computer and Modem to Cable Drop.

You can also look at the Modem Status Page to check your UpStream and DownStream signals. You may have to have someone come out to check out the line running from your house to the pole (or pedestal if its underground)? Many factors can cause an outside cable to deteriorate, and when that happens you can end up with alot of signal leakage and frequent disconnects. And that goes for both overhead and underground lines. Good Luck, and post back if you need more help. (try to include your Modem Status Logs)

Jan 02, 2011 | D-Link (DCM-202) Modem

1 Answer

Comcast is my service provider and I have had an RCA DCM 245R modem for almost 10 years. Until recently it has worked fine. On an ever increasing basis I am losing internet connection and when I look at...


It can be an issue with the modem or with the line. When the line drops the link then the modem shows only two lights. And, when you power cycle the modem (unplug and replug it) it establish the session again with the comcast.

So, i'll suggest you to get the line checked first and if comcast finds that line is working fine then get the modem replaced.


Aug 15, 2010 | Thomson RCA DCM245R Modem

1 Answer

Siemens 4100 modem

You may have a bad power supply.
You would be better off picking up a small APC or UPS and have all your computer devices running thru.
It is common that after a power interruption the modem must reset to regain it lost signal

Sep 12, 2009 | Siemens SpeedStream Modem (4100) (SS4100)

2 Answers

Modem drops connection. Must disconnect and reconnect to restore

There are plenty of aftermarket Cable Modems for sale at most major retailers (Best Buy, Target, Walmart, etc..)

I would go and buy a decent one of these and try it out to really test to see if the modem is indeed the issue here. If the new one works and doesn't drop the connection anymore then problem solved. If however the new one does do the same thing I would check for proper venting area (make sure you don't have anything on top of or burying your modem) first. If that's fine then it could possibly be issues with your actual line and in that case you'll need to harass the cable company until they actually send someone to test your lines.

May 17, 2009 | Arris SURFboard SB4200 Modem

1 Answer

Modem crashes, and won't work again until I power cycle

you may want your cable company to come out and check the forward signal to the modem wich could be to low , or the return to the modem  could be to low/high . one last thing is ,it could be having packet loss so severe that it drops your connection even though the modem stays linked up.

Feb 28, 2009 | Arris SB5100 SURFboard DOCSIS 2.0 Cable...

1 Answer

Modem disconnects from internet. must unplug to reconnect

that is over 26,000 hours of on time. Since most of the modem don't come with a cooling device. the max on time for any given modem is 15,000 to 20,000 hours.
yes, it is time to change a modem.

Dec 30, 2008 | Best Data Products CMX300v2 Modem

1 Answer

Toshiba PCX2500 Cable Modem Problem

Your cable signal is probably to weak at the modem. This is the most common cause, especially if it works and then doesn't, works for a while then doesn't.

Call your cable company and have them come out to check signal strength at the modem.

You could have a damaged drop to the house, water damage on the line, squirrel chew (seriously), dry rotted drop, too many splitters in the house, etc...

Sep 04, 2008 | Toshiba DOCSIS Cable PCX2500...

6 Answers

Can only get dsl if i use landline

Hi, Rob just studied ur problem.Iam a tech which handles this kind of issue. I talk to verizon,at&t,bellsouth,qwest daily for such issues. Well i can suggest u onething u can get the efficient speedstream 4100 series modem which comes with a 1 yr warranty. And also checkout with verizon clearly abt ur distance from the central office.Bcos might be ur dsl circuit may be not technically feasible i:e NTF. For further clarifications plz get back to me.

Jun 07, 2007 | Westell Wirespeed LiteLine 6100...

Not finding what you are looking for?
Arris SB5100 SURFboard DOCSIS 2.0 Cable Modem (50120900100) Logo

771 people viewed this question

Ask a Question

Usually answered in minutes!

Top Arris Computers & Internet Experts


Level 2 Expert

233 Answers

Suddenlink Help

Level 1 Expert

43 Answers


Level 3 Expert

794 Answers

Are you an Arris Computer and Internet Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides