What you SHOULD have said is running PCM instead of FLAC is more susceptable to BUFFER underrun (not jitter), especially over marginal WIFI.
OT but related to jitter - HDMI has a feature call Audio Rate Control (ARC) that appears to allow a single device to control the flow of data between compatible devices. I assume this helps with regard to buffer underrun(?).
However, I was reading some info published by Paul Miller in HiFi News that appeared to show a link between using HDMI ARC i.e. PQLS in Pio's case and a reduction in the correlated jitter measured. Does this means PCM's susceptibility to buffer underrun has a direct link to correlated jitter ?
Avii