Help with log message

I am seeing this warning message, seemingly at random, in the log. Usually it's just a single message, but sometimes two, and occasionally as below, more. So far, I have not been able to connect it with an event, plug-in, or script. I'm hoping someone can give me some advice on where I should look to find the source. I suspect there may be a handles leak associated with it.

Mar-26 9:39:07 AMWarningIn CommitDeviceStatusNow-Inner Loop at line: Collection was modified; enumeration operation may not execute.
Mar-26 9:39:07 AMWarningIn CommitDeviceStatusNow-Inner Loop at line: Collection was modified; enumeration operation may not execute.
Mar-26 9:39:07 AMWarningIn CommitDeviceStatusNow-Inner Loop at line: Collection was modified; enumeration operation may not execute.
Mar-26 9:39:07 AMWarningIn CommitDeviceStatusNow-Inner Loop at line: Collection was modified; enumeration operation may not execute.
Mar-26 9:39:07 AMWarningIn CommitDeviceStatusNow-Inner Loop at line: Collection was modified; enumeration operation may not execute.