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All of my applications randomly closes, it says""xperia keyonboard has suddenly stopped working.......etc". I have already sent my phone to the service center and i just received it from the center. It indicated in the receipt that they fixed it and have done check ups manualy but my phone has the same problems. I just started my phone after receiving it and in the set up guide and i couldn't even use the keyboard to type the needed information, all it said was that the keyboard suddenly stopped working.
When you got the handset back from repair, did you run a restore of any previous backup prior to setup?
It'll be wise to reinstall the latest update, it will smooth things out
Bridge (for Mac)
Alternatives on How to backup Xperias
If that doesn't work, you might want to stop by your local Xperia Care instead of just calling them.