I type Polish a lot on my iPhone, requiring special characters. At some point, this started happening: when I try to type a special character, press and hold brings up the menu, but before I can get to the character, the keyboard goes blank, and I have to give up. I think the phone vibrates once, and it seems like it happens when my finger slips a little off the row of characters. A screenshot looks like this: What the hell is the phone trying to do, and how do I stop it?
EDIT: This is purely intuition, but I think this is supposed to be a feature, not a bug, though I admit, I cannot figure out what the feature is.