after reading that I started wondering if I was imagining things. ran over to a local dicks sporting goods and verified, the xenos that they have in stock do NOT make this noise.
LS didn't call back, but I got through to them later yesterday and got an RMA#. Both bats have done the same thing. The first one we just thought our kid wasn't hitting well, a parent from the opposing team came over after our game and said they thought it was broken based on the sound it was...
if you hit it on the palm of your hand can you hear it? you can feel it as well. her first one lost a ton of pop when it started making the noise. the second one I can't say as it isn't broken in and she never actually hit any balls with it aside from the soft toss.
my 9yo had a 2015 xeno that she used for most of the summer, it developed a rattle on the weekend of the final tournament of the year. (wouldn't rattle when you shook it, but if you hit it against your hand you could hear and feel something loose inside).
was replaced under warranty with a...