Hi I have question regarding configuration of range extender. 
 

In my home I have one router which exposes two wifi networks. One is exposed on 2.4 GHz and second one under  5 GHz. Both of them have different Ssid. 
 

I setup extender to extend range of that 2.4 GHz network. My extended network has the same name as  2.4 GHz network. What I saw in network checking tool extender network is set with same channel as main network.  
 

Basically I have almost default configuration of range extender. Only two configuration options which I changed is disabling dhcp and lower down power of extender. 
 

Problem which I have is when one of my devices is  connected to extender then after some time I have big lag on my network. 
i.e I open browser and entering page tooks few minutes. When I go to tether app for a second app shows that my network is down and after another second everything is fine and I can use internet. 
 

any idea what can I do ??