had same thing happen to me today too. Started today, was good before that and no changes were made to the phone.
Phone is very laggy and slow and a huge drain on the battery by android services. Rebooted 5 times but no help.
Very same happens for me since before-yesterday evening with my Samsung Galaxy S7 (bought ~5 months ago). It draining the full battery in only ~4 hours 30'. Rebooting several times didn't "fix" the problem. I think I saw also an update of Oculus that evening... But it's Android System which is consuming > 30%.
The UI became laggy too and the video (youtube) are continuously stopping (every 5 to 10 sec) although the buffer is still full. My screen is not always on but the phone is really hot. The problem does not depend on my location. I did switch off Localisation, Bluetooth, WiFi, ...
I am using GSAM to "monitor" the battery usage since a long time and I have that battery chart for the past 7 days... But I don't have any figures of the CPU usage before the beginning of this issue.That chart is available only as of Thursday 18:00, exactly when I see that the battery start to be drained full speed (on the short CPU graph available, the average is 40%)
Many people are pointing at Oculus. EX.:
https://www.reddit.com/r/GalaxyS7/comments/55280e/overheating_and_draining_battery/
http://www.digitaltrends.com/mobile/samsung-oculus-gear-vr-app-bug-battery-drain-news/
But no need to uninstall it. Run the app and it starts an update which should fix the pblm.
V.