i have s4 it has wifi issues it works only when you are very close to router

[mjawad14]

i have problem with s4 its wifi works only when i am very close to router.if i move even 5 feet away the network becomes nill and it suggest wifi out of range.what can be done.

 

[mjawad14]

other phones are working well with same router have tried it with different router also but same problem.