Hello, 

After recently upgrading the firmware version to the latest one my router keeps losing internet connection to the 2.4 network and all my smart devices have to be manually reconnected every few hours. This does not seem to affect the 5G network or the LAN devices, they work perfectly fine. I am in no way an expert so I am going to try my best to explain the behavior I have observed so far:

1.The 2.4 network keeps broadcasting but device are unable to connect to the internet ( like unplugging the LAN cable from your ISP from the back of the router but leaving the router on ) 

2. Rebooting the smart devices does not fix the issue as they still cannot connect to the network

3. Rebooting the router sometimes works, sometimes it does not

4.  I use a Fiber-optic connection and the router is connected to another router provided by the ISP. I am not sure if this could cause the problem as the 5G connection and the LAN works perfectly fine but thought I should mention

 So after searching the forums and trying various fixes here's what I have tried until now:

1. Rebooting the Router 

2. Backup & factory resetting the router 

3. Using a WiFi analyzer and setting the channels to the clear ones, also setting the transmitting power to max and channel bandwidth to max. (This did not work so I have reverted to AUTO ) 

4. Upgrading my firmware to a beta version 1.3.6 Build 20200819 rel.50735(4555)

5. Disabled Smart connect 

Do you guys have any idea if this is related to the firmware version or is a hardware version? Also if it is firmware version do you have a previous build (2020) I could restore to as I am unable to find a list with previous firmware versions on TPLink's website 

Also do you have any more tips I could try as I am working from home and my work Optiplex is using the 2.4 Connection so getting disconnected every few hours is becoming extremely infuriating and it is compromising my work.

PS: I have the EU V2. hardware version