MR6400 dropping out

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MR6400 dropping out

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MR6400 dropping out
MR6400 dropping out
2023-10-28 13:32:01
Model: TL-MR6400  
Hardware Version: V5
Firmware Version: 1.4.0.0.9.1 v001.0 Build 220506 Rel. 57555n

My MR6400 4G router with an O2 PAYG SIM has been working fine on 4g for 6 months both in UK and roaming in Spain (O2 is owned by Spain's Telefonica). Over the last 2 weeks it has started dropping out at increasingly frequent intrervals. The same SIM works fine in my phone, even when the data connection is shared via a hotspot. Sometimes yhe MR6400 reconnects on its own, then drops again after a few minutes. Nothing interesting in the system logs, just DHCP and DNS timeouts when the disconnection occurs

 

Thinking it was an O2 problem and under pressure from O2 customer services, I upgraded to an O2 contract Sim 2 days ago, but that has the same problem.

 

The only thing that seems to help most of the time is on the internet page press 'Save' on the canned config O2-contract or sometimes I have to select a different config, save, then reselect o2-contract and save again. It is as if the internal working copy of the config has got corrupted and is refreshed by the save.

 

Is my MR6400 broken? I only bought it in March 2023.

  

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#1
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5 Reply
Re:MR6400 dropping out
2023-10-28 13:44:42

  @Pvha

attaching screenshot of network page shoewng versions at the bottom.

 

Screenshot 

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#2
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Re:MR6400 dropping out
2023-10-31 06:51:36

  @Pvha 

 

Hi, thank you very much for posting on TP-Link Community.

1. Please go to Advanced->Network->Internet page, change Network Mode from 4G Prefered to 4G Only, then check if it would be more stable

2. Please go to Advanced->Network->LAN Settings, set Primary DNS as 8.8.8.8 and Secondary DNS as 8.8.4.4, then save it and monitor.

 

For more troubleshooting steps, please follow this thread: LTE keeps disconnecting

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#3
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Re:MR6400 dropping out
2023-10-31 12:50:48

 

Hi, thanks for your suggestions. Alas they made no difference, It has now got so bad I can only get a few minutes of use after rebooting the router before it drops out.

 

I went to the 'LTE keeps disconnecting topic' and tried to reply to that, but failed to get any attachments to upload, so I follwed the 'email' link in the top mail from @KevinZ, but that led to a form that took all the details but also did not allow for uploading of screenshots or logs. It did raise a new ticket TKID231056209 and when a got an email confirming that, I was able to reply attaching the system log, and the before and after screenshots. Can you access them there?

 

In summary, I bought the MR6400 on Amaxon UK on 18th March 2023, installed it on 24th March and have had it running 24X7 since then. I first noticed some short outages in early September, but around 24th October it started to be really troublesome, failing after as little as 3 minutes and increasingly had trouble getting it to reconnect. This morning only a reboot would work. I rebooted at about 08:31 this morning, and by 08:44 it was gone agsin. Only one wifi user at that time, several runs of the speed checker were OK, then browsing BBC News soon made it drop out.

 

It still will not let me include a log file or screenshots

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#4
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Re:MR6400 dropping out
2023-10-31 12:54:46

  @Pvha 

 

Here is the last bit of the logfile covering the disconnection xxx replaces percieved external limks that eere blocking me posting it


2023-10-31 08:32:43 [6] 4G: USER: Start connecting to the network!

2023-10-31 08:32:43 [6] 4G: USER: Get ISP's profile now.

2023-10-31 08:32:43 [6] 4G: USER: GetCurrProf result is:ipver:2  staticApn:0  authType:2  pkgName:o2-Contract  profname:o2-Contract  apn: xxxxxxx usr:o2web  psw:password  

2023-10-31 08:32:43 [5] 4G: dataSwitch: 1
2023-10-31 08:32:44 [6] 4G: ERROR: 0x0000000E QMI_ERR_CALL_FAILED

2023-10-31 08:32:44 [6] 4G: ERROR: Call end reason = 1.

2023-10-31 08:32:44 [6] 4G: ERROR: Verbose Call end reason = 50, type = 6.

2023-10-31 08:32:44 [6] 4G: USER: Connected to the network!

2023-10-31 08:32:44 [6] 4G: ERROR: 0x00000047 QMI_ERR_INVALID_QMI_CMD

2023-10-31 08:32:48 [6] 4G: LTE connection up
2023-10-31 08:32:48 [5] 4G: LTE internet connected.
2023-10-31 08:32:55 [6] 4G: USER: Get ISP's profile now.

2023-10-31 08:32:55 [6] 4G: USER: GetCurrProf result is:ipver:2  staticApn:0  authType:2  pkgName:o2-Contract  profname:o2-Contract  apn:xxxx usr:o2web  psw:password  

2023-10-31 08:32:55 [6] 4G: USER: Get ISP's profile now.

2023-10-31 08:32:55 [6] 4G: USER: GetCurrProf result is:ipver:2  staticApn:0  authType:2  pkgName:o2-Contract  profname:o2-Contract  apn:xxxx  usr:o2web  psw:password  

2023-10-31 08:32:55 [5] 4G: set LTE static IP connection, needSetDefaultGw:1
2023-10-31 08:32:59 [6] Httpd: DNS 82.132.254.2 resolve succeed for dns.msftncsi.com
2023-10-31 08:32:59 [6] Httpd: DNS 82.132.254.2 resolve succeed for www.msftncsi.com
2023-10-31 08:33:20 [6] Httpd: DNS 82.132.254.2 resolve succeed for dns.msftncsi.com
2023-10-31 08:33:20 [6] Httpd: DNS 82.132.254.2 resolve succeed for www.msftncsi.com
2023-10-31 08:33:45 [6] Httpd: DNS 82.132.254.2 resolve succeed for dns.msftncsi.com
2023-10-31 08:33:45 [6] Httpd: DNS 82.132.254.2 resolve succeed for www.msftncsi.com
2023-10-31 08:41:56 [6] Httpd: DNS 82.132.254.3 resolve timeout for dns.msftncsi.com
2023-10-31 08:42:01 [6] Httpd: DNS 8.8.8.8 resolve timeout for dns.msftncsi.com
2023-10-31 08:44:42 [6] Httpd: DNS 82.132.254.3 resolve timeout for dns.msftncsi.com
2023-10-31 08:44:47 [6] Httpd: DNS 8.8.8.8 resolve timeout for dns.msftncsi.com
2023-10-31 08:44:54 [6] Httpd: DNS 82.132.254.3 resolve timeout for dns.msftncsi.com
2023-10-31 08:44:59 [6] Httpd: DNS 8.8.8.8 resolve timeout for dns.msftncsi.com

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#5
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Re:MR6400 dropping out
2023-10-31 15:15:49

  @Pvha 

Attached at last is a zip file with the full system log from reboot at  08:31 until 08:44 this morning after it had dropped out. There are also the requested screenshots from 08:33 when it was working, and 08:44 when it had stopped working. There was only one wifi client active ovrr the complete period. Carrier is O2 contract. I am based in rural Kent, England, postcode CT4 6XS, where 5g has never been seen, and 4g is pretty weak on all networks, hence signal strength 25%. Nevertheless it has been working fine for 6 months, typically giving me 10MBS, better than the 4MBS I get from copper wire ADSL that I use as fallback.

 

Sorry for the runaround, I only have an android tablet available at the moment and some things are a little harder than I am used to in Windows.

File:
Screenshots.zipDownload
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#6
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