Question about Arris SURFboard SB5120 Modem

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Occasionally, the power light will blink slowly, and no other lights are on, and there is no connection. Disconnecting the box completely and reconnecting, and powering up solves the problem. What is the problem?

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Intermittent connection issues are very difficult for internet service providers to trouble shoot. The first step in trouble shooing any Intermittent connection problem is to look at the chain of equipment involved in flow of data from the internet service provider to the end user. In most homes the packets enter from the main cable line to the modem, than from the modem to the router, and finally from the router to you computer. So that means that the issue can be caused from the following equipment: main cable line, splitter, modem, router, or the Ethernet / wireless card of the PC. Since we know that the connection is being dropped at or before the modem I recommend contacting the internet service provider and demand a service call to swap the modem and check the pole. Your issue can be cause by some thing as simple as a bad splitter in the home or some thing as complicated at an issue at the pole. Most commonly this will turn out to be a bad modem.

I hope that information above has helped is some way.
If possible please rate this solution.

Posted on Sep 01, 2010

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

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Posted on Jan 02, 2017

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I have a switch hooked up to a lamp that occasionally starts blinking, I know that there is a minimum load required, so I installed a 75 watt incandescent bulb. Still blinks occasionally. I have two...

What gives me pause on this is the fact that the problem stays with the application and that your other applications work OK.

What ths issue sounds like is a neutral connection issue.. Many of the Cooper sensor/switch products require a neutral connection to avoid the issue you're describing. If there was no neutral connection, the sensor would draw power, and then dump it out through the light fixture - causing the lamps to flash (like you're seeing). But if you add a neutral connection to the device, the sensor can dump it out through the neutral and not excite the light bulbs.

So why does it work in the other installations and not here? Well, one possibility is that maybe those other installations have a LOT of load (multiple fixtures) so that spike of current isn't enough to make them blink. The other possibility is that maybe there isn't a neutral connection in the box, or maybe the neutral connection was disconnected from the box. I struggle with both these answers especially since you were able to do it successfully in two other locations, but the problem mode you discuss SCREAMS neutral issue.

If you can't solve it by those means, I recommended replacing it with the Lutron equivalent, the MS-OP600M-WH (dimmer) or MS-OPS6M-DV-WH (switch). Neither of these device leak a lot of current and work without requiring a neutral connection.

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