Picture goes to black screen every 2 seconds, but audio continues.
Having the same issue after about a month of having a new Samsung TV and new Roku Smart Sound bar. When TV is first turned on the picture goes to black every 2 seconds but still has sound, after about 2 minutes picture stays on. Found out if we don't use the TV through the Roku sound bar but instead just use the Samsung TV, the picture and sound is fine when the TV is first turned on. Then we switch over to Roku and it seems to be stable.