I’m using a S905X box and CoreELEC 8.95.5. I never shutdown my box so I only switch from TV to HDMI and HDMI to TV.
With the lastest builds (I don’t remember when it started, perhaps 8.95.3), when I play a video, it starts to play some seconds then there is a black screen for 1 or 2 seconds then the video still plays.
I don’t know if it’s an issue or if it’s normal but in the past, I didn’t get this.
What fps have your video? Is it 25i?
If yes, than you can try to left only 50p in whitelist.
No logs, no any details about video stream, no information about your TV frame rate before video starts, as result no answer on your question.
Thank you, I’m sorry I’ll give more elements soon