Why is my battery draining so fast? Android OS using 50%?

[jakemew123]

I have an Nvidia shield tablet. For the past two or three days, the battery is suddenly draining a lot. It says 50% of it is coming from the android OS. What's going on and how do I fix this? Thanks!

 

[B. Diddy]

Welcome to Android Central! A reboot often corrects issues like that--try it, and let us know if it recurs.