I might have a look at one of these...
I dunno what happened with lollipop 5.02 but its borked my xperia z1 in all kinds of ways. I used to own a solid phone that never gave me any problems and had fabulous battery life... now I've got a phone that reboots if the battery gets 49%, can browse on wifi for about 15 minutes before rebooting, is constantly hanging and crashing what had previously been perfectly stable apps.
I want a spare phone handy for when I roll it back. This looks like it could be just the ticket!