30-Nov-2016, 11:36
I do not think that this at all is related to Spark or Dialog. I guess it is a bandwidth/timing issue of the media stream either of the internet connection or of the Dialog/Phantom communication. It could be a simple fallback mechanism which becomes active as soon as there is not enough end-to-end (Tidal ==> Phantom) bandwidth available for streaming in flac.
4 x Gold Phantom via LAN, 2 x Silver Phantom via LAN, Dialog, Remote, Tidal HiFi (Masters/MQA), Bluesound node II (TOS-link to Dialog, MQA), Roon (Mac)