Default Samsung S4 - wi fi problem

My wi fi on samsung s4 simply, cannot stay on. After install new rom( few different roms), wi fi normaly turn on it can see different networks, but cannot connect and stay connected. I try diferent modem versions and diferent modem wi fi fix, nothing helps. Can anybody help?

Android version : 4.3
Bootloader xxud
Omega v 16-xxuemk9
Still cannot find solution, any help?