Raspberry Pi wifi reconnect every 5 min

We enter this crontab entry and try to reconnect wifi every 5 mins 
*/5 * * * * /home/sertac/wifi_reconnect.sh
below you can find script content 
sertac@pz:~ $ cat /home/sertac/wifi_reconnect.sh

ping -c2 8.8.8.8 > /dev/null
if [ $? != 0 ]; then
    ifdown --force wlan0
    sleep 5
    ifup wlan0
    sleep 10
    systemctl restart ssh
fi

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