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I would consider doing a Factory Reset if I were you. The OS should not be sucking up the life of the phone; on my S5 the OS is usually down at the bottom of the battery usage. Of course I did a Factory Reset to fix a few other small issues and now the OS is up toward the top so I need to do another one. In your case I don't think the situation can get any worse.
Just remember to back up all your important files, documents, pictures, videos etc. etc. before doing a factory reset.
