phone wont boot

[AC Question]

recently updated my phone to kitkat apps occasionally crash and now phone is not booting up HELP!

 

[AndroidProf]

Boot into your phone's bootloader and do a factory wipe (will erase all your data on the device) along with a cache wipe. Hopefully this will solve the issue. Of course this is only valid if you're phone is booting up to the title screen and then either turning off or being stuck there