Weird Screenshot and downloads I have a Samsung J3 something... Its thru virgen.

At least once a day my phone freezez then the screen turns black then comes back to normal. Then when I go to my gallery a "file" or "cache" is visible with what looks like a screenshot of my screen. I also have every sticker icon from facebook stickers downloaded into my gallery. I end up having to delete all these icons. 

CAN SOMEONE TELL ME WHATS GOING ON? Am I hacked? Is it a glitch? Any feed back will be appreciated.

 
Screenshots (click images to enlarge)
Your phone is not hacked. Try clearing cache and reboot your phone. It should then act normally.