Security notification

[AC Question]

Hi all. I've been getting this notification "unauthorised actions have been taken" when i click on the notification I'm taken to device security where I get a message that says device is under threat and I need to restart device to clear any unauthorised actions. But it doesn't work. The msg keeps on coming back...

 

[B. Diddy]

Welcome to Android Central! Which device is this? Is it a Samsung device?