@TP-Link So I finally found the culprit. It was one of the switches that caused the speed to degrade. When logged in in the SG105e I noticed that one of the ports has its Speed/Duplex actual setting...

Hi @TP-Link #1: This happens every couple of days, not multiple times per day #2: Yes #3: I will and let you know.

@NanoG6 Thanks for replying, i can check the upload speed as well. I will also switch it with another to see if it still happens or not. I was hoping to be able to debug this to see what is happening.

@NanoG6 Yes it is connected via Ethernet when this happens. What is strange to me that it always degrades to the same limit ~ 80-90 Mbps. As if there is some limit somewhere...

I have the following setup Deco M5 (main) -(utp)-> TP link switch SG105 -(utp)-> Deco M5 -(utp)-> TP link switch SG105 -(utp)-> Deco M5 -(utp)-> Deco M5 (X) -(utp)-> Laptop The Deco M5 marked with X...

Hi @TP-Link I tried a factory reset but still the issue keeps coming back. Any suggestions?