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Finally saw this issue today. The song would play and pause, like it was buffering. I also had maps up and several tiles were missing. At the time, I only had 1 bar of service.
This morning however, I got trapped in a "can't load" loop. Hitting next simply displayed a can't load next track message. This went on for the 20 minutes I was driving - though I only checked every couple of minutes.
I had the exact same thing happen to me this morning. At a certain point Slacker wouldn't load the next song, no matter what I did. I eventually ended up switching to terrestrial radio. On the drive home everything seemed to be fine again.
It is annoying to have to deal with the occasional stuttering at the start of a song though. That's been happening a few times a week since I took delivery of the car 2 months ago.
I was noticing this issue all throughout the day on the Slacker app on my iPhone. I'd chalk it up to a Slacker server issue rather than a problem with the Tesla Slacker app.