Automatically reconnect to the wifi network

create a file:
/usr/local/bin/wifi_rebooter.sh
with these contents:

#!/bin/bash

# The IP for the server you wish to ping (8.8.8.8 is a public Google DNS server)

SERVER=8.8.8.8

# Only send two pings, sending output to /dev/null
ping -c2 ${SERVER} > /dev/null

# If the return code from ping ($?) is not 0 (meaning there was an error)
if [ $? != 0 ]
then

    # Restart the wireless interface
    ifdown --force wlan0
    ifup wlan0
fi

Make it executable:
sudo chmod +x /usr/local/bin/wifi_rebooter.sh
Schedule it by appending this line:
*/5 * * * * root /usr/local/bin/wifi_rebooter.sh
to:
/etc/crontab

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