Default [Q] Lock Screen edit

Hey guys!

I have a Xperia ZQ (the brazillian model from ZL) and I've updated it for 4.2.2 last week.

Since this, when I turn on the screen, it automatically enters at lockscreen edit mode, every time, and this bothers me a lot.

It's something like this (I can't post links, so please remove the * from it) --> im**3PqnxEt

I think it's not a configuration problem, since I've tried a factory reset using PC Companion. Anyone knows about this, have the same issue or knows how to "fix" it?

Thanks, and sorry if there's any errors in typing.

PS: My phone is locked and unrooted, and the firmware ir the 10.3.A.0.423