Why does crepe myrtle tree loose its bark?

crape myrtles and peeling barki havent found out WHY yet... but it exfoliates every season.

diseases are mostly from bugs that suck the pollen, but this isn't proven to peel the bark.

crape myrtles are very tough and they can survive in a huge range of temperatures and landmasses, except salt water/an ocean breeze is a weakness.