So. This morning I received the OTA update for Android 6.0 on my Nexus 5. Previously had no problems with battery usage, but after installing the update my battery is drained within an hour, without me using the phone in any way.
The settings indicate that the Android Core Apps are the cause of this and when I press the information icon in the top right it shows 'Contacts Storage'. I have to say that also since the update, my contact list is empty and keeps showing the message 'Contacts are being updated'.
Any clue on how to solve this issue?