Xperia z3 wifi not connecting

[BCAM]

Hello, I just received my Xperia Z3 but the wifi is not connecting.
It can't obtain an IP address when set to DHCP. if I change it to static IP it will connect to my router but won't have any connectivity. This is the third router I've tried to connect to. All other devices are working fine, including an Xperia ZL, iPad , iPhone, Mac mini and MacBook Pro.
Please help, thanks!

[Derelict_17]

My z3 stopped being able to connect to my wifi a month ago after two months of no problems. All it is saying is authentication error. Password is correct. Strong signal. Everything else connects to it. I can connect to brothers phone's hot spot just fine.
What can I try?

[stockyvillage]

@Derelict_17 have you rebooted your router?If you have and it is still the same,do a factory reset on router

[one_tall_boy]

hi , i have Xperia Z3 Dual D6633, i bought this about 2 mounths ago, 3 days ago i get the update notification on my phone that needed PC. i Conected to PC and update Android 4.4.3 to 4.4.4.. after that i  have 3 problems. 1- my wifi can not conect, its go on and off, and cant search for new access point, and when i try to conect to my access point one message appear on screen " Fail to Conect to Network", 2-Battery Charge going down too fast, 3-bach side of my phone temprature goes up, when i turn on my WIFI, or my Data.. , i think it has Software problem , please help me ,