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G34 slow upload speed with Cox - G34

  • July 20, 2025
  • 1 reply
  • 19 views
J
The Many

I purchased the G34 in March 2025.  ISP is Cox w/ 500 mbps download speed and 50 mbps upload speed.  Up until recently, I neared the maximum speed in both directions using an ethernet connection and slightly slower as expected using Wi-Fi.  Over the last few weeks, however, the ethernet upload speed is less than 1 mbps, while the  download speed is near 500 mbps.  (The Wi-Fi speeds are unchanged.)  But when I activate my VPN, the upload speed is ~50 mbps.  I have reset the G34, but the upload speeds remain painfully slow unless thee VPN is activated.  Any thoughts on how to increase the upload speeds when not using the VPN?

 

Best answer by SURFboard Moderator

Please check for Loose or corroded coaxial connections. 

If the signal levels are out of the acceptable range, they can lead to the kind of slow speed 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:

http://arris.force.com/consumers/articles/knowledge/G34-G36-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.

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S
Wi-Fi Warriors
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Please check for Loose or corroded coaxial connections. 

If the signal levels are out of the acceptable range, they can lead to the kind of slow speed 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:

http://arris.force.com/consumers/articles/knowledge/G34-G36-Cable-Signal-Levels

If you find that the signal levels are not within the recommended range, we suggest contacting your Internet Service Provider (ISP) to have them reviewed and adjusted as needed.

SURFboard Community Moderator Team

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