How I broke my Z5c

today I was running with my phone using it as Spotify player. After some time I decided to shoot a photo which I did and put phone into the pocket
For unknown reasons my phone switched off (realized once music stop playing) - I took the phone off and saw its on booting screen
Instead of waiting I've pressed power+vol up ( I guestt) - phone vibrates 3x and turn off again much quicker

unfortunately instead of going straight to main ui it asked me to start initial setup :P

when I got home i tried to put my password (using 1password to generate) so after 3attempts of putting it wrong i went to google to reset my main google password - and this was my misstake as phone does not accept it

after some googling it seems that i can only use google account + password used with the initial logon to the phone, because i;ve change it i have to wait 72 hours before loging again :D

how silly i am

my only conern is is it really me doing hard reset or not? maybe the phone went crazy for some reasons? any thoughts?

PS look like power button works even when pin locked so phone can be easily rebooted/power off