Charles9162 Said:
"[...]Is there a user accessible way to determine the app that’s sucking up the memory and fix it?[...]”
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Yes: Activity Monitor
RAM is intended for multitasking. To see what is using most of the RAM view it using the Activity Monitor, Close whatever it is. Perhaps, it is a virus scan that is always going on in the background. Go Here: View Memory Usage in Activity Monitor on Mac.
Uninstall Security Software:
Moreover: Rid your Mac of any A/V and Security Software. It's unneeded on a Mac, as it just gets in the way. This is a pure example of it getting in the way. You are getting that message most likely because of the software installed that is used for managing your Mac.
Use an Uninstaller for the Software:
Removing Security Software from your Applications folder will not rid of it all, as much of it will remain in your system cache. So, contact the developer and request the uninstaller.