Default [Help] 4.3 N7100DDEMJ9

after i update my Note 2 sometimes when i try to connect in wifi it turns (Wifi toogle OFF) help me please do i need to reflash the 4.3 firmware in latest firmware???

EDIT: but sometimes its connected... hm we can say 30/70 30% of connected 70% cant connect in one day...

But in Mobile data there is no problem.. just in Wifi