Muso randomly forwarding tracks?

Hi everyone, 

I'm guessing a network issue, but my new muso (running wireless from a synology nas) can't seem to resist playing about 30 secs of a song then skipping to the next. 

Was fine last few days. Todays it's a pain in the ar$E. Can't seem to stop it. I choose an album, hit play in first track & then get treated to a 30ish sec intro of each track in sequence. The router doesn't have Internet yet, and the muso says there's an update to be had, but seems odd how it's been fine last couple of days then a pain today. 

Any ideas?