MP4 - Flash indicator keeps blinking

MP4 - Flash indicator keeps blinking

I've noticed that the Flash indicator in the Controller Tree window of MP4 (v4.3.3 build 17523) keeps blinking when i am connected to the MC.  I do not have any commands in the program tasks that are explicitly reading/writing to flash.
The system consists of a Flex-6 Nano with two ethercat drives attached.

Is this typical of that indicator or something in the ethercat drive config?