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My XPS shutdowns randomly after flashing to ICS.
While shutting down It displays Android System and a dialog box which says shutting down
please help......
Might be a long shot, but have you tried switching SIM-card in the phone?
Sometimes they effect more then you might think, so it could be wise to try with another one. 
If that won't solve it, try repairing the phone's software in Sony PC Companion. You can find that option in the section called Support Zone in PC Companion. You can download PC Companion from the link below.
http://www.sonymobile.com/gb/tools/pc-companion/
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Tried repairing the firmware but still the same issue .. How can i retrive a crash report form my Xperia S.
Because i think there is some app which is causing it..
after repairing the firmware there was no problem till a week but now its back..... request you tell what should i do..
Its is really sad for me to see that there is not support given ...
After doing 3 hour of research on the internet i read that this problem occurs due to battery calibration problem .....
Request you to please let me know what can be done at the earliest..