Sir I did everything, checked all DFS channels one by one. It keeps changing from DFS to normal channels even though they are not there.

My settings.

Channel Width: 160mhz

Channel: DFS100- DFS128

Mode: 802.11ax only

But after some time it changes to

Channel Width: 160mhz

Channel: 149-161

Mode: 802.11ax only

I did every possible way to fix but nothing works. I don't have any other router at my home I tried to downgrade the firmware too. But no luck. Please check the video I have posted.

  @Jason2988   [TP-Link Support]-[TKID220224436] 

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Dear Customer,

1.According to the log file, it seems that the time zone setting on the router is different from the one on your computer. Please change the time zone setting first.

Visit tplinkwifi.net, click Advanced-> System->Time & Language. Please change the Time Zone of the router. 

2.After changing the channel and the bandwidth, did it only affect the 5G-2 speed or affect 5G-1, 2.4G & Ethernet speed at the same time?

Please choose the same Speedtest server when you're testing the speed. In your video, sometimes you use "Excitel" speedtest server, sometimes use "Tata Play Fiber".

Please do the speedtest for several times and find the most stable server for the test. Keep using the same server for the test.

3.The wireless signal changed significantly on your computer. Have you ever moved the position of your computer yesterday?

Hi Tassy,

1. According to the log file, it seems that the time zone setting on the router is different from the one on your computer. Please change the time zone setting first. 
"I have tested this already many times. No luck." 

2. After changing the channel and the bandwidth, did it only affect the 5G-2 "Yes" All other bands work normally. 
   Speed test with other bands with the same server had no issue. USB transfer also affected the 5G-2 when it’s changed to normal bands.

3. When you were testing yesterday, I placed the laptop beside my router. Later I moved to another room just 10 meters away. (signal fluctuation is too much with these AX90 routers).

 
I am testing this router last 3 weeks. The service center has changed this router and given a new one. This one has the same issue. 
 
Anyway, this router does not have many settings to play with. All settings were checked by me many times.
I just want to know how it gets changed even after manual setting when those channels are not there. ( Don't say RADAR is here) It should switch to another DFS channel if it is used by the RADAR. why it goes on a normal channel.

Don’t make me fool?  I have many TP-LINK devices at my home none of them had such an issue.  I already told you no RADAR site is here. 

I want a solution. I haven't contacted you to waste your and my time as well.

Regards,
 

All the emails I sent today were not delivered. Your system is marked as spam. This is very unfortunate. Don't sell crap products if you don't want to support them.