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a month ago
Hey, I've seen many people have the crash issue. There is one remedy for checking this happen because of Facebook app or any other applications.
My xperia z1 too had this Problem
SWITCH OFF YOUR MOBILE PHONE >AND PRESS AND HOLD SWITCH ON BUTTON > (3 seconds AFTER LIGHTS ON) > PRESS AND HOLD VOLUME DOWN BUTTON FOR 15 SECONDS
You can see "safe mode" written on left bottom of screen.
This will not let your THIRD PARTY applications to work...if problem doesn't occur again do uninstall all applications and download only necessary.