Still have warranty? If so, it might be a DSC module that needs to be program and updated.
I am personally not familiar with rx8s, however I am a BMW tech. Occasionally problems like that occur only when 1) a programming issue which needs software update 2) Something is internally damaged at the DSC module.
If you still have warranty, I would most defintely bring it back to a dealership and have them take a look at it.
Good Luck
-AzEKnightz
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