Screen goes on and off audio is alright

The screen on my un60ks8000 will start and run for a few minutes then goes on and off every few minutes when playing either cable or amazon fire stick. The audio is alright and keeps playing as it is going through a receiver. After playing for a few minutes the problem may reduce or go away, but not always. Does the same thing whether cable input or amazon fire tv. Signal is going through a Marantz receiver and problem exists whether receiver is turned on or off. Marantz allows signal to pass through.