Hi, I have been noticing since last Tuesday that my iPhone 6 battery drains faster than usually. I have checked the battery usage per app and Calendar (background activity) is consuming 25% in the last 24 hours when in the last week only consumed around 13%. I have all my apps closed when not using, and Calendar is one of the apps I use the less. I haven't updated iOS since I have 8.3 since launch day. Besides, my father's iPhone 4 (iOS 7) has been experimenting the same issue since the very same day, so I wonder if is there something going on with Apple servers. I have just reset the network stats to see if it is related to unusual data consumption from the calendar app. Has anyone noticed this too?