Android Tablet Hacked ?

Having Been Aware of Innocently Getting on the Wrong Side of Someone Who I Know Is a Hacker, via Social Media, Is It Possible Please, That He May Be Able to Get Screen Grabs or Audio/Visual , as Occasionally, Without Any Logical Reason, My Android Tablet (that I use for Social Media) Flashes as if It Has Taken a Photo .. ?

or Might There Be a More Innocent Reason for This Please ? Thanks