Thanks chewitt I will have a look at how to do the clean log in debug mode next - might take me a while. It is pretty easy now to reproduce the issue. But since I posted earlier today I was playing around a bit further, and the blank screens and audio dropout is happening whether HDR or not. So interestingly, it looks like on v13 it isnt related to HDR. On v12 I could disable HDR and the problem went away, on v13 that isn't the case. I have also played with adjust refresh rates on start/stop to off and turned off HDR - neither have made any difference. I don't get any audio dropouts in 4k HDR or dolby atmos. Even after playing a stand def 480 old version of a film, when stopped playback I lost the screen and HDMI couldnt detect the signal.