I have noticed when I play a recorded programme the audio stutters for a couple of seconds and does the same when pausing and unpausing. Little annoying however once it has stopped it doesn't do it again unless you pause or play something else.
I have looked at previous threads on this but could not find the setting on my fire stick to see what the audio driver settings are - there doesn't seem to be anything related to audio driver on my advanced settings under playback.