I doubt it's a problem with the cats too, but generally a blinking CEL indicates a "catalyst damaging misfire". Doesn't sound like you are actually encountering it, but I would agree with christian370Z, you should get a scanner on it and check it out.
One beautiful thing about the 370Z and the CAN system is the freeze frame data on a stored code is much better than old OBDII standards, so if there is a code stored the information in the freeze frame should be quite helpful.
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