Share your experience!
i have the exact same prblems too and 5 of my friends 
You should repair phone software,not downgrade.
Download sony update service.
Im facing the same problems even after factory reset and after repairing my mobile via cc and sus.. it works for awhile then everything goes hay wire..
I have no extra apps installed app from bloat ware.
photos in album all load after first boot then after 60% are blacked out
Phone hangs
takes awhile to switch off
eco mode doesnt repond... press wait or close
when i put my mobile to sleep.. when i try to awake it again it takes afew presses of the power button before it comes alive
camera pictures are real hazy far worse than orig firmware.. I dont take pics now as im so annoyed
everything was working fine up untill 4.3