MR6400 4G Slowdown Over the Course of a Day

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MR6400 4G Slowdown Over the Course of a Day

This thread has been locked for further replies. You can start a new thread to share your ideas or ask questions.
MR6400 4G Slowdown Over the Course of a Day
MR6400 4G Slowdown Over the Course of a Day
2021-03-16 12:11:24
Model: TL-MR6400  
Hardware Version: V5
Firmware Version: 1.1.0.0.9.1 Build 200511 Rel 43036n

Hi,

 

I am getting great speeds of around 65Mb d/l and 10-15Mb u/l but every morning that is reduced to around 20-25Mb download (upload stays roughly the same).

 

A reboot of the router and the speed is back to normal high levels. 

 

Does anyone have any ideas what may be causing this?

 

Many thanks

Mat

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Re:MR6400 4G Slowdown Over the Course of a Day
2021-03-17 07:59:33

@MathewR 

Hi, did both the Ethernet connection and wireless connection have the same unstable speed issue?

Have you checked the LTE band status when the speed slows down every morning and is it the same as when the speed is normal?

 

Thank you very much.

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Re:MR6400 4G Slowdown Over the Course of a Day
2021-03-17 08:20:56

@TP-Link 

This is on Ethernet, so wireless is not coming into the equation. I haven't checked the band information as I put the router into an auto reboot at 5am so today it is great. Will check the band info now, disable the reboot and check again in the morning and report back.

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Re:MR6400 4G Slowdown Over the Course of a Day
2021-03-18 08:58:32

@TP-Link 

 

Hi, after disabling the auto reboot yesterday... same thing this morning... around 60Mb most of the day yesterday and now 16Mb this morning.

 

Here are the details from the router:

 

Yesterday ~60Mb

Band: 7

Sig Strength: 75%

RSRP: -108dBm

RSPQ: -9dB

SNR: 15.8dB

 

This Morning ~16Mb

Band: 20

Sig Strength: 75%

RSRP: -94dBm

RSPQ: -11dB

SNR: 9.8dB

 

This Morning After Reboot

Band: 7

Sig Strength: 50%

RSRP: -109dBm

RSPQ: -10dB

SNR: 14.6dB

 

Thanks for taking the time to look at this for me.

 

Mat

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Re:MR6400 4G Slowdown Over the Course of a Day
2021-03-20 17:38:30 - last edited 2021-03-20 17:51:49

Hey, your speed drop is due to the Band 20 being more crowded, slower than Band 7, in your area. The modem tries to connect the band that it sees with stronger signal but it can be a slower mast, as in your case. There is an effective solution but you will need to update your official firmware to the beta firmware provided by TP-Link. So with this beta firmware you can choose manual band selection and force the modem to connect to a certain band that suits better for you, in this case Band 7. (but you should try all available bands before deciding which to manually lock your modem onto). This beta firmware is mentioned in various threads here on this forum. Here is the direct link for it: https://static.tp-link.com/2020/202012/20201208/TL-MR6400(EU)v5_1.1.0_0.9.1_%5b201113-rel63736%5d_up_boot_all_2020-12-08_09.38.45.zip

 

It worked for me (and for many others) flawlessly. I tried it first, locking it to the available bands and checked the speed each time then chose the one that was the best, in my case it's Band 3.

This beta firmware works, it hasn't ever had any drop, disconnection or any failure since the firmware update. Just a side-note: I connect this modem to another router, so I don't use the wifi on the MR6400, only use it for the main purpose as a 4G modem.

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