If your cronjobs stop working, check that your password hasnt expired., since once it has, all cron jobs stop  . There will be messages in /var/log/messages which show issues with cron

If your cronjobs stop working, check that your password hasnt expired., since once it has, all cron jobs stop.
There will be messages in /var/log/messages similar to the one below which show issues with authenticating the user:

(username) FAILED to authorize user with PAM (Authentication token is no longer valid; new one required)