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Post the screenshots and also repair the phone with PCC
Bridge (for Mac)
Alternatives on How to backup Xperias
http://talk.sonymobile.com/thread/36355
everyone is facing same type of problem in m4aqua dual but sony is not providing any help to their customer.on the name of brand we purchase these costly phones. and facing these types of problem.
That's normal, more so if you are syncing multiple accounts and/or services that require internet access.
I don't know if the other phones have a lower screen resolution and size, I don't know what other apps you might have running on the background, etc
You have a taskiller, or battery app, etc, those apps create a lot more issues and closing the apps will drain more battery as they will reopen soon after you close them. Which phones are you comparing?