Last night, I went to sleep at 12am with the phone at nearly 100%. When I woke up at 7am, the battery was down to 50%. I noticed that the Backup app was constantly running while the device was locked, on wifi, but unplugged from power.
https://imgur.com/PGit67f
It looks like there is some issue with the automatic iCloud backup. The last successful backup was a month ago, around the time I got the phone new. It gets stuck on "Estimating time remaining...". I can sync with my mbp, imac, and air without an issue.
https://imgur.com/SsMur8Y
I signed out of iCloud, hard reset, then signed back in, but it still will not complete. Turning off iCloud backup appears that it may prevent the a