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Archer C9 keeps rebooting/restarting randomly

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Archer C9 keeps rebooting/restarting randomly

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Archer C9 keeps rebooting/restarting randomly
Archer C9 keeps rebooting/restarting randomly
2020-10-11 18:34:39 - last edited 2020-10-11 19:30:29
Model: Archer C9  
Hardware Version: V5
Firmware Version: 1.2.4 Build 20190403 rel.63869

Archer C9 V5 this week started rebooting randomly. I already replaced power supply from different unit (I used two other power supplies - one with 12V and 2A output, and another with 12V and 2.5A), but this doesn't helped. I refleshed firmware, used compressed air to remove dust from inside (nothing really get out, so it's probably clean inside). I saw many similar problems - what happened? It's insane!

 

Also I have this error in LOG, but I saw that this is "normal" (creating software that in normal condition output errors to log is not normal, but we are on tp-link, so here everything could be normal):

 

[946] Config importing failed

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#1
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2 Accepted Solutions
Re:Archer C9 keeps rebooting/restarting randomly-Solution
2020-10-11 19:27:50 - last edited 2020-10-11 19:30:29

@swuggmaister 

 

So the USB is not source of the problem. This need to be investigated by tplink - of course I can send back on warrenty, but this is not looking like hardware problem. For many people C9 stareted rebooting last few days. And symptoms are same. Nothing helped, reconfiguration or firmware flash also didn't. It must be something IN the software. It doesn't metter if any apple product cause this, because router should be bullet proof from that point of view.

 

Few years ago I had on my company network one tplink access point and it was restarting like crazy. Simmilar symptoms caused (at the end) by some android device that we used for development purposes. And after 1.5 year (!) they released firmware update with exact note, that some android devices could cause stability problems... this is how tplink support sold devices. No mesh support for C9, no firmware update, unsolved bugs...

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#14
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Re:Archer C9 keeps rebooting/restarting randomly-Solution
2020-11-11 01:11:26 - last edited 2020-11-18 02:39:32

Hello all, thank you for your patient waiting and cooperation on this debug process.

 

Note: Please always ensure you are running the latest official firmware on the Archer C9 v5 first.

 

While if you still encounter the auto-reboot issue with the latest firmware, here comes with a beta firmware that may help with the auto-reboot issue you guys encountered with the Archer C9(EU) v5, please give it a go and see if it will resolve the issue. Below is the download link:

https://static.tp-link.com/2020/202011/20201112/c9v5_eu-up-ver1-2-5-P1[20201110-rel73750]_nosign_2020-11-10_20.34.13.zip

Note: If you have an Archer C9(US) 5.0, you can also try to install this beta firmware. While if you have other customized versions, this will not work for you.

 

Please upload this firmware into your Archer C9 v5 by referring to the below guide:

https://www.tp-link.com/support/faq/2139/

 

Kindly let the community know if your issue is resolved with this firmware or not, thanks very much~

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#110
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126 Reply
Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 18:45:10

@dmk Hey mate.

I have the exact same issue since 1.5 weeks ago. I have had this router for 2 years without any issues at all.

I have done all your things, today I did a soft reset (see the attached file) and also I updated the time settings on my router to get the NTP server from google and adding summer/winter time to change automatically. I have red others having this exact issue and this two things have sorted it.. I just did it 1 hour ago so I dont know if it will help..

 

Lets keep in touch here to fix it.

File:
c1385a90b5084a1894836bf66fe6ead2.pngDownload
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#2
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 18:51:15

@Kevin_Z
Can you please help us? This is VERY common on the forum for C9 for the latest 2 weeks this issue has come.

This is something on your end.

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#3
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 18:56:50

What kind of devices are you using? Maybe we will find some device that is causing that.

 

Another point of view: maybe this is some attack on our routers. Are you connected directly to your ISP's with exposed (public) IP?

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#4
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:04:50 - last edited 2020-10-11 19:06:34

@dmk 

I am using a Philips Hue, Macbook Pro, Some Iphones, a TV box for IPTV. I have had the same devices for these 2 years so I doubht this is it. I am 100 % sure from reading on this forum that it is on TP Links side..

 

And yes, I am connected directly to my ISP.

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#5
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:07:11

@swuggmaister 

 

Ok, I'm also using apple infrastructure (iPhones, iPads, MacBooks, Apple TVs and lot of automation devices with HomeKit integration). So both of us are using Apple products. In last 2 weeks (when this starte happening) there was no major iOS/ipadOS/macOS updates. Only tvOS get minor release. And I was using macOS big sur AND iOS 14 in beta for about last 8 weeks or more without any trouble.

 

What about your ISP? Are you exposed to Internet via public IP address?

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#6
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:10:39

@dmk Indeed. Yes I am. I am using Ownit in Sweden if that is of any help. But I talked to my ISP and they said its nothing wrong on their end.

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#7
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:12:51

@swuggmaister 

 

I don't think that this is connected with this or that ISP, but could be connected with exposing NAT to public access. Someone could for example DDOSing our routers. What about NAT Boost, are you using it? If yes it means (as in my case) that you have anti-ddos protection disabled (could not enable both NAT Boost and DDOS protection). I'm using NAT Boost for performance purposes (I have simetric 1Gbit connection and I need full speed).

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#8
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:15:08

@dmk 

You are getting a bit more technical then I understand right now.. :) Where can I check this?

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#9
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:18:05

@swuggmaister 

 

Probably this will be path in english/swedish software version:

 

System Tools -> System parameters -> NAT (and there should be two cehckboxes - NAT and NAT Boost)

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#10
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Re:Archer C9 keeps rebooting/restarting randomly
2020-10-11 19:19:03
Yes, both are ticked in.
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#11
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