Powershell script erroring with PSSecurityException only 5% of the time

We have a ps1 script that simply checks for log files over a certain size and emails us. It runs every five minutes 24/7. It usually works but about 5% of the time we get an error ( + CategoryInfo          : NotSpecified: (:) [], PSSecurityException      + FullyQualifiedErrorId : RuntimeException.  Process Exit Code 1.  The step failed.)

Since it runs successfully most of the time it couldnt be an actual security error we assume. Has anyone run into this it is driving us crazy trying to figure it out. Any help or suggestions would be most appreciated!