Volumio suddenly stops playing

Sometimes when I am playing from my NAS, Volumio suddenly stops playing in the middle of a track. The timecounter halts, but sometimes only the digits halt. Volumio is otherwise fully operational, and I am able to skip to the next track, which then plays and then suddenly stops also. Sometimes the next track won’t play at all, but the following track does.

Volumio 1.4
D-Link ShareCenter NAS