Not entirely unheard of for exhaust bolts to rattle loose, although if that's a stock exhaust on a low-miles 2013 that nobody's messed with, it shouldn't have been loose already by now, probably insufficiently tightened at the factory. Just put some anti-seize on the bolts as long as you're messing with them, check that the gaskets are in one piece, and torque it back down.
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