Here's a weird bug I've experienced twice on the N85-3 (fw: 11.047)
When I'm typing to a contact and try to delete a character, the cursor deletes all text and the phone subsequently becomes unresponsive. My assumption is that the delete command is still happening.
There's only two commands the phone responds to at this point:
Sliding it to change the screen to landscape
Pressing the power button
I have to reset it to fix it. It's an intermittent problem and doesn't happen most of the time though.
{All thoughts & opinions expressed above are my own, and not of any other organization}