RT-BE92U LAN issue after upgrading to the latest firmware

[ashishrc]

I am facing the following issue with both RT-BE92U_3006_102.5_0 & RT-BE92U_3006_102.6_0, whereas the initial release version RT-BE92U_3006_102.4_0 works perfectly fine.

The RT-BE92U LAN port behaves weirdly after upgrading to RT-BE92U_3006_102.5_0 & RT-BE92U_3006_102.6_0. Both versions exhibit the persistent behaviour, even after a complete router reset.
Before installingthe new 6.0 and 5.0 versions

After updating to RT-BE92U_3006_102.5_0 & 6.0

All 4 LAN Ports behave the same. Do you have any advice on what to do?

 

[Tech9]

How exactly do you measure LAN port 1-4 Ethernet throughput using cell phone? Just looking at the Wi-Fi signal icon the first test was done with good signal 3-bars, the second with weaker signal 2 bars. Did you check RSSI level and link speed to this client in System Log, Wireless Log?