Default Criticism for improvement thread

So i've been a Xperia Z owner since release and I would like to open this thread so that people can talk about the problems they faced with their phones and if it can be improved by Sony.


Problems I've had:
1. Power button suddenly stopped working, after which I went to a sony center to get it fixed. I had an unlocked bootloader and they refused to repair it, even if I was willing to pay money. I got it repaired from a third party shop. This is just poor customer support.
Xperia Z C6602