I have, say, two apps running. I make a call and I'm going through a phone tree (e.g. "push 3 to go to the next desired level").

I push 3, but then then things don't respond properly. Pull the phone off of my ear and in front of my face and realize that it's changed from the Call screen/app to one of the other running apps. Have to toggle (quickly) back to the Call screen to continue the call. Or (at the beginning) fumble and lose the call.

Does this happen to others? There must be some way of preventing this (other than saying: "you must be a klutz")?