Help sorting out 5.1 on Amazon Fire TV 4K? - Plex

#1
Any time we play a movie in plex (SD or HD) and use the AC3 5.1 track we get audio skipping, it can be a minute of 2 between skips and then the lights on the amp show the signal is lost for a spit second, sound cuts out for a spit second before everything picks back and carries on and then repeats; the downmix AAC stereo plays fine and 5.1 plays fine from any of the Amazon Prime content!

Is this being looked at? Does someone know how to fix it? It's driving me nuts...
I don't really want to send the Fire TV back as I am a prime member so a solution would be great!
 
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