App constantly forgets your trips and gives error message if you try and relink. Be careful with Qatar. They send messages to say your flight is cancelled and propose a different flight. But, when you check the original flight isn't cancelled.. still accepting reservations. They just want to give your seat to a customer they value more, or want to move you onto a more empty flight. The first time this happened I thought it was human error. Now it's happening again. So it's clearly policy