I too have experienced the error message. Fortunately, I have Pandora on my 8310 as well. So when Slacker begins to misbehave, I just shut it down and use Pandora
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After it skips the first song then The error message says "An error has occured, Please try your request later."
This has been happening for a few weeks now so i think i have waited long enough for it to be later
and as for pandora i tried it but my phone is not supported
Did you ever try an uninstall and reinstall? I think I had this problem, and when I did this, it worked fine. Haven't had a single problem with it since.
I keep using this over Pandora, as Slacker supports stereo Bluetooth headsets, and the caching really helps out with battery life!