Intermittent sound issues watching movie through HDMI connection to TV

Gents I watch downloaded movies on TV through my Asus netbook and VLC media player......I use the HDMI connection and after a period of time (can be 10 minutes or longer) the sound becomes distorted....if I then open my netbook it clears it only to repeat later so I just keep opening/closing my netbook.....I do not get the same problem when I use the same connection through my Lenovo laptop so it appears its my netbook that is causing the problem...if I switch TV,s the same issue is there....I do not know if its relevant but both pc,s (Win 10) are set up as to "do nothing" upon closing the lid...when I close the lid on the netbook there is a couple of seconds delay on pic and sound yet with the Lenovo no delay whatsoever.
Any ideas please?

In your search box,type in dxdiag and have a look at the sound pages to see if they identify any problems.If not,then check Reliability History and see if there are any reports.

Thanks tried that and all seems fine....thanks anyhow

That's pretty weird as it sounds like the audio is timimng out. Just wondering if the output device in your audio settings is set to the TV or the laptop speakers? Try the troubleshoot features in settings and also check the sleep settings on the laptop are set for a longer period of time. It might be something that simple.