I am also experiencing this.
The charging also seems to randomly stop before 2%, and drains the battery back to flat again.
(Unless i inadvertantly hit a key or cable or something, that caused it to discharge.).
I thought it was too good to be true; that Sony would release updates to the Z1 that wouldn't kill off the handset.
-Unfortunately for them, I got a two year warranty as standard.
(I have about 5 months left.).
It's a shame that I'll have to lose all of my user data, though.
-Either through a factory reset, or going out of my way to complain about it.
Worst thing is: Although Android 5.0.2 took a rediculous length of time to get to me, (OTA. /EE. I think it may have even been yesterday,) everything still seemed decidedly glitchy.
(I did have some screen shots. -Maybe not anymore.).
-In spite of these glitches, I was thinking that Android 5 almost refreshed my Sony Z1.
It made me think, "Oh, actually... Maybe I would be interested in a Z5 when it's released. Sure those Samsung S7 rumours look pretty good, but sony have been giving me good customer service with the updates, and a nice two year warranty...", and so on.
Now I've had to look up an issue with the phone, I'm seeing all sorts of stuff about random screen warping, an array of issues with the battery/ charging/ wireless charging... And the rest.
Worst of all: There are anecdotes about Sony representitives refusing to honour the warranty!
This is a PR. disaster for Sony, if you ask me.
In some ways, it's almost like they expect you to upgrade your phone every six months.
I'm writing this here in the hope that sony read these pages, and might pay attention.
-I already find myself reluctant to look at HTC. branded phones after the whole HTC One X travesty.
I really hope that I don't end up with the same bitter after-taste from sony.
Thanks for telling me that it's firmware by the way, It's a big help to know that I can always just hit, "Reset to Factory Settings", and have a working phone again, if it comes to that.
