Sometimes while the SB Touch is playing a track it displays a message that it was not able to fetch the information for the next song in the playlist from the server ("Could not open file" or words to that effect appear shortly on the screen). 
Then when the current song is finished and it starts playing the next song in the list it shows this new song as having a track lenght of one hour ("59:59"). It will then be stuck on that track for an hour unless you stop and restart playing. Did not have the patience to wait and see what happens if the one hour mark is finally reached.
The fact that it is not able to fetch the info for the next track is possible a WiFi issue, using a wired connection it does not occur. But I think it should handle this kind of network error more gracefully.
This problem did not occur with the official release version of 7.5.0. It started appearing with the official release version of 7.5.1.
It is also only happening on both of my SB Touch players, not on Duet and not on SB Radio