Has anyone seen this message before written to an EdgeFrontier systems error log?

This occurred recently in more than one system, at different times. When it does happen, it generally spits out thousands of these errors. I've looked through various logs and can't find a direct reason as to why this happens. This is happening after months and hundreds of thousands of successful messages have been read/received/written through these systems, so please understand that it is not a 'in-development' system that I am referring to. These errors are occurring long after a system has been stable for months with zero errors.

I am hoping one of you have seen this before and know what it was that 'caused' the error to occur.

'Reloading' the system causes the errors to stop, if that helps.

Thanks in advance,

Brien Foss