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Deco M5 speed degrades after a few days

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Deco M5 speed degrades after a few days

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Deco M5 speed degrades after a few days
Deco M5 speed degrades after a few days
2021-05-03 18:41:58 - last edited 2022-10-05 11:05:10
Model: Deco M5  
Hardware Version: V3
Firmware Version: 1.5.3 build 2010203

I have the following setup

 

Deco M5 (main) -(utp)-> TP link switch SG105 -(utp)-> Deco M5

                                                                           -(utp)-> TP link switch SG105 -(utp)-> Deco M5

                                                                                                                            -(utp)-> Deco M5 (X) -(utp)-> Laptop

 

The Deco M5 marked with X is the one giving trouble; what happens is this:

 

Everything works fine, after a few days the performance of that Deco degrades (from 500Mbps to around 85-90Mbps).

When I switch both utp cables from position the performance is back to normal again. After a few days I need to repeat this.

The other deco's do not have this problem. I tried replacing cables but the issue remains.

What can be the cause of this? Is there someway that I can debug this to see why this deco decides to maximize this the speed to 85-90Mbps.

(btw it is always around 85-90Mbps).

 

Best regards,

Lars

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#1
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1 Accepted Solution
Re:Deco M5 speed degrades after a few days-Solution
2022-10-05 11:05:01 - last edited 2022-10-05 11:05:10

  @TP-Link So I finally found the culprit. It was one of the switches that caused the speed to degrade. When logged in in the SG105e I noticed that one of the ports has its Speed/Duplex actual setting to 100MF (when Config was set to Auto). When changing that to manual 1000MF the performance no longer degraded. See image below, Port 4 was reporting only 100MF.

What can be the reason that this is automatically set to 100MF when the Config is set to AUTO instead of 1000MF?

 

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#9
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8 Reply
Re:Deco M5 speed degrades after a few days
2021-05-04 01:49:18

@vonklars 

Are you sure the X router is connected to another Deco using cable? Please check (when the speed degrades) in the app it must "Ethernet";

 

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#2
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Re:Deco M5 speed degrades after a few days
2021-05-04 06:39:49

@NanoG6 Yes it is connected via Ethernet when this happens. What is strange to me that it always degrades to the same limit ~ 80-90 Mbps. As if there is some limit somewhere...

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#3
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Re:Deco M5 speed degrades after a few days
2021-05-04 07:08:24

@vonklars 

I was also have this issue, but only download speed that have issue while upload speed just fine. I have sold it and bought a new one and problem solved. 

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#4
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Re:Deco M5 speed degrades after a few days
2021-05-04 08:21:42

@NanoG6 Thanks for replying, i can check the upload speed as well. I will also switch it with another to see if it still happens or not. I was hoping to be able to debug this to see what is happening.

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#5
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Re:Deco M5 speed degrades after a few days
2021-05-05 08:38:33

@vonklars 

Hi, we would love to help you debug the current issue.

At the same time, could you please help me check some details:

1. How often did this issue repeat within one day?

2.if not unpluging the cables, would the speed stay at 85-90m/s？

3. Could you please swap the location of this Deco with others to check whether it is always the same one that had the issue?

Thank you.

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#6
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Re:Deco M5 speed degrades after a few days
2021-05-05 09:05:20

Hi @TP-Link 

 

#1: This happens every couple of days, not multiple times per day

#2: Yes

#3: I will and let you know.

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#7
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Re:Deco M5 speed degrades after a few days
2021-05-06 07:06:50

@vonklars 

Thank you very much and please also leave me a private message for notice;

Thanks.

Deco Monthly Recap- Check What's Currently Going on With Deco KidShield Test Recruitment, Share Your Ideas With us! Wi-Fi Schedule Ideas Wanted!
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#8
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Re:Deco M5 speed degrades after a few days-Solution
2022-10-05 11:05:01 - last edited 2022-10-05 11:05:10

  @TP-Link So I finally found the culprit. It was one of the switches that caused the speed to degrade. When logged in in the SG105e I noticed that one of the ports has its Speed/Duplex actual setting to 100MF (when Config was set to Auto). When changing that to manual 1000MF the performance no longer degraded. See image below, Port 4 was reporting only 100MF.

What can be the reason that this is automatically set to 100MF when the Config is set to AUTO instead of 1000MF?

 

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#9
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