[f4aii]

When i shutdown wifi, i have this:

ESP8266 FW Version: AT+GMR

AT version:0.60.0.0(Jan 29 2016 15:10:17)
SDK version:1.5.2(7eee54f4)
Ai-Thinker Technology Co. Ltd.
May  5 2016 17:30:30
OK
Mode station OK
Join AP failure
Multiple mux ERR
Start tcp server ERR
Set tcp server timout ERR
ESP8622 init end

My router only gives addresses between 192.168.0.10 and 192.168.0.60

WIFI CONNECTED
WIFI GOT IP
AT+GMR

AT version:0.60.0.0(Jan 29 2016 15:10:17)
SDK version:1.5.2(7eee54f4)
Ai-Thinker Technology Co. Ltd.
May  5 2016 17:30:30
OK

Mode station OK
Join AP success
IP:+CIFSR:STAIP,"192.168.1.151"
+CIFSR:STAMAC,"5c:cf:7f:c2:60:bb"
Multiple mux OK
Start tcp server at port 80 OK
STATUS:2
Set tcp server timout 30 seconds
ESP8622 init end

i try too with DHCP function, it's always the same IP.
I have listed all the devices connected to my router and none is unknown to me.
***************************************************************

I try with an old router: linksys BEFW11S4 with 192.168.1.xxx IP adresses and WEP encryption. The board connect internet and wunderground in one minute.

ESP8266 FW Version: WIFI CONNECTED
WIFI GOT IP
AT+GMR

AT version:0.60.0.0(Jan 29 2016 15:10:17)
SDK version:1.5.2(7eee54f4)
Ai-Thinker Technology Co. Ltd.
May  5 2016 17:30:30
OK

Mode station OK
Join AP success
IP:+CIFSR:STAIP,"192.168.1.151"
+CIFSR:STAMAC,"5c:cf:7f:c2:60:bb"
Multiple mux OK
Start tcp server at port 80 OK
STATUS:2
Set tcp server timout 30 seconds
ESP8622 init end

the board is connected but i have always the same adress.
Should I upgrade or reset the wifi module? If so, how?

thanks for your help.