Haha. Not a very constructive post, I know, but this reminds me of something that happened to me last week.

I was viewing a screenshot of my desktop in the gallery, something distracted me so I put the phone down to go check it out. When I came back it had gone into standby mode, pulled the lock switch down tapped my email shortcut and........... WTF is going on here?
Tapping the screen like a demented chimp until I realised what was happening.

But anyway, back on topic.
I used to get disappearing widgets before PR1.2 and when I went to replace them the menu was full of "Cairo" stuff. Happened a couple of times after PR1.2 but discovered it was one of the widgets that was causing it. Not seen the problem since.