It happens to me too. That screen where you have to et them know why you are cancelling has been there for awhile. But you press the reason and it still doesn't let you cancel. Have to force close the app and then cancel again. Usual reason to cancel is because pax has requested in the stupidest place and won't move towards you in a safer place to stop. (usual message they send is 'I am here, please come to me". Many morons.