No, there's no additional hardware (except additional RAM, but that was installed long before the errors came).
I forgot to mention that sometimes the player settings get lost when the error occurs.
It also seems to be somewhat temperature-dependent in that it appears to be less likely to occur when I bring the empeg to the car from inside, compared to when it's been locked in the cold trunk. But it's a fairly weak correlation.
It also seems to happen less often if I start the car and the empeg has been running before, e.g. when it's been sitting in the garage with the empeg in its sled as opposed to when I put the empeg in the sled from outside. But that's also not 100%.