Silent songs

[renichms]

Seeing posts about computers having issues with this but none for iOS so far.  A number of songs now play silently every time I try to play them.  Progress bar moves, no sound.  Same results for headphones, car speakers, phone's own speakers.  Same results no matter how I tweak settings.  Any ideas when this will be fixed?  The number of silent songs is steadily growing.  I'd contact Spotify but can't readily find any direct means of doing so.

[WDM]

I think I have seen this happen too, but for me it is always seems to be  a problem with the songs in my playlists that are local to my computer (e.g. Led Zep), and no longer seem to sync correctly, after I upgraded to IOS7/5s.

[Husabergarn]

I also have this problem running spotify in Windows 7. And it seems to be the same songs playing silent.

Progress bar is running and when full time is reached it do not play next song.