Hey all. We've seen quite few reports recently of error 802 when trying to play certain tracks, even though they will play on a mobile device and still show as available in the catalogue. Spotify are aware of the issue and are investigating so, hopefully, there will be a fix soon.
In the meantime, if you are getting this error with a particular track in a playlist, removing it then re-adding it has worked for some people.
If you could post the URI of any tracks you have this issue with (right-click track title > copy spotify URI) together with a note of where it occurs (playlist, album, artist page) it will help the support guys to pin down the problem quicker, thanks.