ok issue solved : i notice with iwconfig that something was wrong on my PI :
pi@octopi:~ $ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11 ESSID:"Livebox-19B0"
Mode:Managed Frequency:2.412 GHz Access Point: 90:4D:4A:F7:50:50
Bit Rate=5.5 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:on
Link Quality=59/70 Signal level=-51 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:45366 Invalid misc:0 Missed beacon:0
and 1 minute after :
pi@octopi:~ $ iwconfig
lo no wireless extensions.
wlan0 IEEE 802.11 ESSID:"Livebox-19B0"
Mode:Managed Frequency:2.412 GHz Access Point: 90:4D:4A:F7:50:50
Bit Rate=96.1 Mb/s Tx-Power=31 dBm
Retry short limit:7 RTS thr:off Fragment thr:off
Power Management:off
Link Quality=60/70 Signal level=-50 dBm
Rx invalid nwid:0 Rx invalid crypt:0 Rx invalid frag:0
Tx excessive retries:59256 Invalid misc:0 Missed beacon:0
as you can see, wifi interface as a very high Tx excessive retrries (14k in minutes...)
that should explain the problem : may be thin changes in API charge more the network and when i updated it overflow the wifi and causes the bug...
if its true, its not really a bug, but my advice is that users who experienced (under octopi distribution) same problem may :
ssh octopi and type :
sudo iwconfig wlan0 power off
test if its ok
then edit /etc/network/interface :
sudo nano /etc/network/interfaces
by putting (on the wan part) :
wireless-power off
then CTRL + x
and it should worlk...
to verify : iwconfig shows me no more Tx excessive retries