Since yesterday I've noticed my phone asking for my iTunes passord upon unlocking it. It will happen if I'm at the home screen, or if I was inside an application when I had locked it before. Only thing I can note was maybe something went wrong during updating of 3 apps, which one got stuck and told me I should update it through iTunes. I noticed an install icon sitting there for part of the day, so I manually deleted it. Still, just now, a day later and after a full sync, I unlocked my iPhone and I get the password screen again. I swear I didn't ask me for the last half of yesterday, so why now? I just unlocked my phone again, but this time, no password pop up.