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Good to know.
your phone wont be fast enough till you delete that official ROM and have a custom ROM.
I had the same problem as yours, and tried every thing to repair it, reinstalled the official ROm again, and still the same problem.
I would advice you to move into a new experience with your phone, I have OMNI ROM, and it works perfectly, Just like new.
I believe the sony developers are into new phones like the z2 or z3, and they dont give a sh**t about the Z clan grandfather the original Xperia Z.
cheers