Ah, i also made a thread about this issue, didn't notice it wasn't being discussed here already: Very short audio cut outs every ~5 minutes
I just did an experiment: i went into audio settings and just tried changing random settings to see if it would have any effect, and not 100% sure about it yet, but disabling "send low level noise" seems to have fixed the issue on my end. I just watched an entire episode of 50 minutes without noticing this happening at all, while before it was just like you said every 5 minutes or so audio would drop for a second.
Give it a try & see if it makes a change on your end. No clue how the settings could be related, but it seems to have worked on my end for some mysterious reason.