[Q] Power Button don´t work after reboot

Hi..
My button power or lock screen dont work but i can flash with odin so the button work for that
I see on the forum need root but i dont want because i lost warranty :S
Anyone can help me?!

Model: GT-N7000
Country: Portugal (TPH)
Version: Android 4.1.2
Changelist: 1103517
Build date: Fri, 19 Apr 2013 17:02:58 +0000
Product Code: TPH
PDA: N7000XXLT5
CSC: N7000OXXLT2
MODEM: N7000XXLT3