That's what I meant by "occasionally hiccups on (though often it plays them without any hiccup)" i.e. I will get a hiccup (usually a couple of hiccups over several seconds), but if I play the track again it won't hiccup. However, I have several tracks that this happens to regularly (say every fifth time I play these tracks).

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Unit serial number 47 (was 330 in the queue)...