I did a reset on my phone, I think there was a bug or an app that was causing some issues. So I thought I'd start fresh.
I have no issues doing this as all my personal stuff is cloud based and I took the pictures off beforehand.
I decided to start fresh completely with no apps being reinstalled, just new installs.
One of the things that slightly irritated me was OneDrive as it didn't play nice with Stamina mode on my Z3, neither does Outlook. So I turned off camera backup on OneDrive which is slightly annoying.
I'm now running a test to see how the phone runs without Stamina mode out of curiosity and since I got things nice and new.