Display out of sync with song playing, randomly stops

My duet has recently started becoming out of sync with the display both on the controller and web interface. The next song will start to play but the display appears as if the prior song is being repeated. There doesn't seem to be too much pattern to this happening. Whilst this is just slightly annoying, far more annoying is that the music will stop playing all together, but again the display continues as if the song is continuing. Stopping and starting restarts things.

Have tried factory reset of receiver and controller and reinstall of the server. Any help greatly received!