"Improperly shut down" error message.

We are occasionally getting this error message on startup:

Warning

This device was improperly shut down on its last use, which can corrupt your system.  Please use proper shutdown procedures - by powering off via the browser from the application or the shutdown command from the welcome screen.  Contact ETC technical services if this message is displayed after a correct shutdown.

 

This is an XP based Element (2014), running the 2.6.4 software.  We normally use the power button to shut down, two presses with a space between for the "Are you sure?" to pop up.  This has only happened three or four times in the last six months, and with different software versions.  I haven't tried a deep clear but I get one of those with each software install automatically (according to the manual) and I've updated the software a couple of times since this started.

We are pretty sure we are consistent in our shut down procedure.  Any thoughts?

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