So I have this iPhone 4s, which has a serious problem: when doing absolutely nothing with it (it just sits in standby mode) the battery drains from 100% to 0% in about 12 hours or less. Also, it appears to be working very actively, as it is constantly warm.
Does anyone know what the cause of this is, and how to fix it? I do have all the latest updates, so that can't be the issue (I think).