I don't even know how to describe my frustrating right now. 
 

I bought 4 Deco BE75 and 1 Deco X20 and 20+ Kasa matter switches. 
 

Initial all the nodes were connected wirelessly and all networks work fine. However 2 weeks after some nodes started dropping out the mesh network here and there until they cannot resume. I had to restart the entire network. 
 

so I bought a TP-Link TL-SG108S-M2 switch and hooked up using Ethernet cables. 

Everything is fine except now my 2.4ghz network doesn't have any internet connection. It will be good for 10mins right after a reboot then goes right back no connection.

i looked up all the threads and tried network optimize and it doesn't work. Keeps saying it's perfect. I tried changing the DNS and many other methods which none of the fixed the issue. It took me 2 weeks finally made it work for 2 days after I removed the "mynetwork_IoT" to "mynetworkIoT".

While I'm very happy for 2 days, now it stopped again. There's no internet connection and I don't know what to do. I'm not changing the ssid again, it takes too much time to change all the switches. 
 

TP-Link please please tell me how can I fix my 2.4ghz. I thought buying all your stuff would make my life easy but I have to say it's not. Why can't we just have a stable 2.4ghz network? I know it works because I had it running for couple weeks using wireless connections. 
 

if this cannot be fixed that means I will have to switch the brand for good and thank god I haven't go all in with those kasa and tapo things because my 2.4ghz doesn't work.