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W21 surfboard losing connection

  • August 23, 2025
  • 1 reply
  • 28 views

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My connection randomly keeps shutting off. I use a w21 arris modem with a surfboard model sb8200. I have tried hard resetting it, unplugging both for 5-10 minutes, I have tried moving the router around the house. To no avail. It used to work great, now we can hardly stay on the internet for more than 5 minutes at a time. Is there any solution to this?

Best answer by SURFboard Moderator

To help isolate the issue, we need to start by checking the SB8200 modem, as it is the device responsible for providing the internet connection.

When the connection drops, could you confirm whether the modem automatically reboots?

We recommend checking the cable signal levels within the modem. If the signal levels are out of the acceptable range, they can lead to the kind of connectivity issues you're experiencing.

When the signal levels are within the recommended range, your modem can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

https://arris.my.salesforce-sites.com/consumers/articles/knowledge/SB8200-Cable-Signal-Levels

The cable signal levels displayed on the interface page reflect the signals being transmitted by your Internet Service Provider (ISP).

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1 reply

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To help isolate the issue, we need to start by checking the SB8200 modem, as it is the device responsible for providing the internet connection.

When the connection drops, could you confirm whether the modem automatically reboots?

We recommend checking the cable signal levels within the modem. If the signal levels are out of the acceptable range, they can lead to the kind of connectivity issues you're experiencing.

When the signal levels are within the recommended range, your modem can maintain a stable, high-quality connection to the internet

Please refer to the link below for instructions on how to check your cable signal levels:

https://arris.my.salesforce-sites.com/consumers/articles/knowledge/SB8200-Cable-Signal-Levels

The cable signal levels displayed on the interface page reflect the signals being transmitted by your Internet Service Provider (ISP).