Why does my phone keep rebooting and it says Android is Starting.. Optimizing app ?

[AC Question]

my phone is keep rebooting ant itsays "Android is Starting... Optimizing app "

plz help me,i did press restart my phone once but it never turn on again ,it turn on for a while n says "android is starting...optimizing applications and keep repeating itself. now what should i do..?,my phone is xperia z ultra n its on andriod 5.1

 

[dpham00]

Re: my phone is keep rebooting ant itsays "Android is Starting... Optimizing app "

I would try to clear cache in the bootloader