yeah, mine is doin the exact same thing

. they are small little cracks that u cant even feel if u run ur hand across them, but are noticeable. its on my hood, roof, and trunk. an autobody place told me its most likely the cause of a bad factory primer. before gettin it repainted those areas would have to be sanded down until theres no paint before repainting because if not it would most likely start happenin again.
they may have made up complete [censored], but since i know nothing about paint, i would never know. best if you hear it from someone else on here that knows more about it.
good luck
oh yeah, Welcome to CEG!