I have been facing issue with my PC connection and laptop Wifi Connection.
I have a PC and laptop, PC is connected to Router via Lan wire. 
Whenever i start my pc it shows no internet, after 5-10 mins automatically the internet starts working
Same goes with my laptop whenever its connected to Routers main wifi network it shows connected but no internet.
One thing I've Noticed is that when i switch off my extender My PC lan internet immediately starts working without waiting 5-10 mins 
and same with laptop, my laptop connects to main router wifi easily and internet starts working
My laptop gets easily connected to range extenders Wifi and works without issue, my mobile phone works well in both router and extender network.

i have tried switching off DHCP in extender

changind dhcp giving different range of ip to extender
Adding static ip to my laptop 

still no clue i need help