Help upgraded from 2.3.4 to 2.3.6 wifi dies after a while


as the topic says, upgraded from 2.3.4 to 2.3.6 and now if i leave the wifi on after a while gets disconnected, says "scanning" and 3g is connected, i have to turn it off and then turn it on again, sometimes says error and i have to reboot phone...

any suggestions ?:thinking: