Welcome to the forum. The best I can say without more info is that, at times, apps or the phone OS will just go nuts and use lots of data or battery in a very short time. I know that doesn't help much, but computers just do weird things sometimes. A restart should get you back to normal. If you still see issues after doing that, check in Settings, Battery and see if there is an app using lots of battery. If you can't resolve I'd take it to your carrier's store and have them take a look.
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