On the 4.6, I'd be looking at the alternator. No software needed for this. Just unlock the cluster and monitor the voltage. See if when you get the trifecta it coincides with a dip or rise in the voltage.

There are other possible causes, but again, I'd start with the alternator since it's easiest to check. Are you moving everytime the error occurs or does it happen at a stand still too?

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