I've had my maxx for about a month and a half. Lately it seems like the battery is starting to die faster. Has anyone noticed this? When I charge it I use the DU battery saver app, and never charge it past given charge time. If it says “2hrs 34 mins to full charge" i set an alarm and unplug it when charged. That's good right? Also. Secondary. I flew on a plane and had it in airplane mode for roughly 5 hours. Barely used it except for a little music. Went from 94 to 62 percent. Why? One more thing. I read to drop phone to 4% turn off and fully charged. Is that good advice? Thanks in advanced!!!!