LR4 Give Preview Cache Error

Every time I use LR4, it encounters an error at some point in the first 10 minutes of use.  It always says, "Lightroom encountered an error when reading from it's preview cache and needs to quit".  What can I do to resolve this issue?

I renamed the *lrdata folder to *lrdata.old then rebooted into LR and let LR rebuild that folder.  Seems to be working so far.  I'll let you know if this isn't a fix.

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