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Warning of low WAN port speed

Warning of low WAN port speed

Warning of low WAN port speed
Warning of low WAN port speed
a week ago
Tags: #Network Connectivity #Firmware Update #Feature Request
Model: Deco M5  
Hardware Version: V1
Firmware Version: 1.9.1

Since latest firmware upgrade I started getting the low WAN port speed warning, and the speed is only 94 Mbps even though I have 1 Gbps (all historic speed tests - last in April 2025 - have been at 780 Mbps or more).

I use the original cable supplied with the 3 piece Deco box, which should be cat5e. And until recently worked in the same setup without any warning. Besides the main Deco M5 in version 1.0, I have 2 more M5 version 1.0 and 1 M5 ver 3.2.

Besides the reduced speed my Google Chromecast started loosing connection every few minutes. The Google Chromecast is 2 meters away from the main Deco and also this worked without issues for years until this happened.

 

Do I need to roll back to an old firmware? If so what version and where to get this?

 

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#1
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3 Reply
Re:Warning of low WAN port speed
Yesterday

  @ErikN 

Hi, thank you very much for your time and patience.

Have you tested with another new cable? There was some negative feedback about the Ethernet cables included in the package before. It's worth a try to replace the Ethernet cable.

I don't think there is a need to roll back the firmware.

Have you tried to set "Connection Preference" for the Chromecast to the main Deco+2.4Ghz to see whether it helps improve the stability?

 

Wait for your reply.

Best regards.

 

▶Check What's Currently Going on With Deco ▶Deco Wi-Fi Heatmap ready for Test!
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#2
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Re:Warning of low WAN port speed
17 hours ago

  @David-TP 

Thanks for your reply.

 

 I switched port on both router and Deco, and switched cable and restarted. This fixed the wan port low speed, and doing a speed test confirmed that I'm back to old speed.

 

BUT: the Chromecast disconnects still happen every 5-15 minutes.

 

Any suggestions?

 

/Erik

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#3
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Re:Warning of low WAN port speed
2 hours ago

  @ErikN 

Hi, I saw you mentioned there is also an ISP router. Did you set Deco M5 into "Access Point" mode?

Have you already set "Connection Preference" on the Chromecast?

It is also recommended to set "Address Reservation" for the Chromecast.

Then disable "Fast Roaming" and "Beamforming" on the Deco App>More>Advanced.

 

By the way, apart from the Chromecast, did you run into similar disconnection issues on other 2.4GHz devices?

Thank you very much.

Best regards.

 

 

▶Check What's Currently Going on With Deco ▶Deco Wi-Fi Heatmap ready for Test!
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#4
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Network Connectivity Firmware Update Feature Request
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