So this has happened a few times now and it's beginning to get annoying. Among other issues my iPhone has been having, some times after i fully charge the phone at night, i'll wake up to it with only half battery. So i check the usage, and this morning for instance, it had 7h 58min standby, and 7h 58min of usage, so it basically was in use since i unplugged it last night. What is up with this, and how can i fix it?