Sounds like you have either a
daemon or a cron job that is doing this.
If you can't find where this is running from you should have a cron log. It might be under /var/adm/cron/log. This file will tell you what is running from cron, if it doesn't appear obvious in the crontab.
OR if you can change the location of the logfile, I would try that also.
BTW, when you loaded this app, did it give you any options to set? like where the logfile goes, what the parms are, etc...
Hope this helps...
