WLAN does work? or not

[RotatoGonzales]

hello there,
i have a little problem 
because my LAN speed and consistency is absurdly bad i switched to wlan and its way better but here is my situation
we have a router the main one lets call it 1 
we have a repeater lets call it 2 
i can connect to 2 everytime but i have some ping problems when using it so its better to use 1 
i cant connect to one because its everytime stuck with "authentificating" and sometimes there is "cant connect to network"

it ONLY works when i delete the WLAN profile with cmd netsh wlan delete profile name= " " and then it works and i can connect.
when i restart my computer its the same again doesnt work
again i can everytime connect to the repeater but not to the main one.
appreciate ur help and stay safe 
thanks 

[Technane]

How are you confirming you are connecting to the Repeater and not the Router? as they should be seemless? and look exactly the same? 

[RotatoGonzales]

2 hours ago, Technane said:

How are you confirming you are connecting to the Repeater and not the Router? as they should be seemless? and look exactly the same? 

i have two available connections on my PC : Fritzbox xxx (main) and Fritzbox yyy (repeater) 
i can see the both of them on my pc and can click to connect on both
but only the repeater connects successfully with my pc
on other devices i dont have that problem