Kernel linux-headers-3.2.0-4-amd64 3.2.53-1 - the same result. Freezes very often. SysRq don't work. I noted that freezes may be on different stages: ifconfig wlan0 up ifconfig wlan0 down dhclient wlan0 iwlist wlan0 scan iwconfig wlan0 essid <network_name> key <key>