I subscribe to tidal lossless streaming (FLAC) http://tidal.com/ and use the following devices:
Macbook Air (OSX)
Naim ND5 SX Streamer, a device which is supported by Tidal
During the early evening I experience buffering issues and playback stops. Occasionally they also stop playing in the afternoon. If I leave a playlist on repeat, I can guarantee it will stop playing.
I have had techs confirm the connection is good (up to 108mbps), had the devices wired to the modem by Ethernet, and have had a SuperHub 3 replaced with another SuperHub 3. I have also tried assigning google public DNS as suggested by Tidal.
My Hi-Fi dealer , Auto-T in Manchester experiences exactly the same issues and believes it has something to do with Virgin's service seeing the FLAC streaming as a torrent and choking the connection.
I had no issued on Sky broadband (17mbs) over wi-fi or wired.