iPadair get hotter and hotter

like the title said, my iPad air get hotter while playing movies,
it happens man times!

luckly,I backed up the old version:3.2 and 3.3.
they’re cool.really cool!

Hope for your reply!

Best regards

my device:
ipad air run with iOS 9.0.2
infuse pro version: 3.6.1