There is currently a beta 2, please install it and restart your device again
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A beta is not a Official version she is A Trial version and thus it includes serious errors, among other things, the battery life but also heat problems. If it's really that bad, I would recommend getting out of the beta and switching your device to the public version via the MacBook or Apple Store. Most of all, the Beta 7-8 are the really most stable versions and run better but above all the RC.