[Q] obtaining ip address wifi

Hi , I've an issue from some week with my i9505 , when i try to access to a network without using static ip address , it says obtaining ip address in loop. I've searched for a lot of solutions , if i put static ip address it works but at university i can't use static ip address i must use dhcp , another solutions was to root the phone and delete some dhcp files, also that i tried when I delete this files and i try to connect to a wifi network they obviously are recreated but I've still a loop with obtaing ip address, I've android kit kat.

Hoping someone will help me thanks

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