I got a replacement iPhone yesterday. I set up the watch with my new phone. I charged the watch to 100 percent and then put it on during the night...maybe around 3am. I only looked at it a few times after I woke up and by about 9am the phone was trying to go into power reserve mode. That seems like a crazy quick discharge. I charged it again this morning...and took it off at 94 percent around 10:30. It's already at 65 percent and it is 2pm. I have only used it to send 2 texts since I took it off the charger this morning. I haven't changed the settings in it but usually end the day worth about 1/2 the battery left. Any ideas what I can do or what could have drained it so much while I slept?