I place a call and a callee is busy. I want to click "end call" button, but just a bit before that app figures out it can stop the call, so it switches back to main screen. The touch on the same spot now means something entirely else - so a new call is placed and I try to stop it in a fit of panic.

It happened at least 3 times in last two months.

Update: I am not suggesting adding a delay, that wouldn't help with anything.