NIS Version 21.4.0.13 Suddenly Disabled

I was working on a document a moment ago and suddenly I received an alert that NIS was disabled. I ran the "Fix Now" app and was instructed to uninstall any other antivirus software installed on my machine. However, I do not have any other antivirus software running.

 

I restarted my pc and NIS loaded and for a moment all seemed well. exactly one minute after booting the same alert appeared.

 

Any suggestions?