Why is my tablet flashing

[Android Central Question]

I have about a 6 month old samsung tablet, it was running great then all of a sudden while i was on it it flashed black for about 3 seconds. About every 10 minutes or so it does this now, and sometimes its really slowwwww. I tried turning it off and on but it didnt help

 

[B. Diddy]

Welcome to Android Central! Which tablet do you have?