cleanup_apache_semaphores.sh

#!/bin/bash

max_apache_semaphores=20
cur_apache_semaphores=$(ipcs -s | grep -c apache)
apachectl=$(which apache2ctl apachectl 2>/dev/null)

[[ ${cur_apache_semaphores} -ge ${max_apache_semaphores} ]] && {
  logger -t $(basename $0) "Cleaning up semaphores for apache"
  ipcs -s | awk '/apache/ {print $2}' | xargs -n1 ipcrm -s
  ${apachectl} restart
}

Add as script in /etc/cron.hourly and chmod +x the script