Audio cutting out for less than a second every couple of seconds

Server Version#:1.19.4.2902-69560ce1e
Player Version#:4.19.2

I have a synology NAS running the above version of plex, streaming over a wired connection to my 2020 QE70T samsung running tizen and the plex app.

The video works perfectly but sound will play for a couple of seconds then cut out for a very very short amount of time then start again. Films are currently unwatchable due to the frequency of audio drop outs.

I would say around 3-5 audio cut outs over a 10 second period all literally just a complete stop in sound for a bar/fraction of a second.

Audio resumes in sync but obviously massively annoying.

The file I am trying to play is ac3 5.1 audio it says,
If you go to information while playing it says:

can direct stream audio: true
can direct stream vide: false
setting - dolby digital ac3: false
allow direct play: true

Not sure if any of that helps. I have logs but when you download the zip you get 141 files so not sure which would be best to add?