Improving script to check site response and restart the server

Any suggestions how I can improve this script. We are receiving 200 response but server is doesn't always restart

#!/bin/bash

if [[ $EUID -ne 0 ]]; then
        echo "This script must be run as root"
        exit 1
fi

if [[ -f /etc/maintenance ]]; then
        echo "In Maintenance Mode : Skip operation"
        exit 0
fi

if [[ $(curl -m 2 -s -o /dev/null -w "%{http_code}" http://127.0.0.1:8080/statusCheck.page) -ne '200' ]]; then
        echo "[$(date)](server20) : Server Down!" >> /etc/check.log
        THISTIME=`date +%s`
        if [[ ! -f /etc/LAST_DOWN20.chk ]]; then
                echo $(date) > /etc/LAST_DOWN20.chk
        fi

        TIMESTRING=`cat /etc/LAST_DOWN20.chk`
        LASTTIME=`date +%s -d "${TIMESTRING}"`

        if [[ -f /etc//LAST_RESTART20.chk ]]; then
                TIMESTRING=`cat /etc/LAST_RESTART20.chk`
                LASTRESTART=`date +%s -d "${TIMESTRING}"`
        else
                LASTRESTART=$THISTIME
        fi

        ELAPSED=`expr "${THISTIME}" - "${LASTTIME}"`

        if [ "$ELAPSED" -gt 120 ]; then
                if [[ -f /etc/LAST_RESTART20.chk ]]; then
                        TIMESTRING=`cat /etc/LAST_RESTART20.chk`
                        LASTRESTART=`date +%s -d "${TIMESTRING}"`
                else
                        LASTRESTART="0"
                fi

                ELAPSED=`expr "${THISTIME}" - "${LASTRESTART}"`

                if [ "$ELAPSED" -gt 300 ]; then
                        echo $(date) > /etc/LAST_RESTART20.chk
                        touch /etc//maintenance
                        /etc//dump_server20.sh
                        /etc//force_kill_server20.sh
                        rm /etc//maintenance
                        echo "[$(date)](server20) : Server Restart!" >> /etc/check.log
                fi
        fi
else
        if [[ -f /etc/LAST_DOWN20.chk ]]; then
                rm /etc/LAST_DOWN20.chk
        fi
        echo "[$(date)](server20) : Server OK!" >> /etc//check.log
fi