I agree it kinda sucks on the part of not responding to the unlock screen command achieved by pressing the power button. I am facing same issue too. I wish they fix this bug. I am also having issues with the proximity sensor detecting when the phone has been removed from the ear-calling position.
Another thing, the damn thing can’t pull my names form my contacts when someone calls or when I call and I have not found a way around it. Every one who calls me is marked as an anonymous caller despite me having their contacts on my phone and on my gmail/contacts. I have to keep saving the numbers afresh by updating their existing contacts as they call thus I end up saving the same phone no. twice under one name. I wish I didn’t go for the update since now even people who I owe money can get me without me ignoring their calls since I have not mastered their numbers #NjaanuaryWoes