I know that feeling But I think it also saved me many games. It is just a subjective feeling most of the time. But I think it was last season there were 2 goals in the 96' minute I believe and they saved me. This is what makes it a fun game. Everyone leading on a match day wants the final whistle when all results are perfect after 70 minutes and you know exactly that every point could still be destroyed.
This situation started to happen to me very much unfortunately in the recent times. For example I made a prediction in the La Liga pool like the Las Palmas-Celta Vigo match would end 1-1. And it ended 2-1 by the goal came in the 90+7th minute. When matches result in like this it becomes really annoying for you. It is very delightful to win in the last minute as well. However I can't say that I experienced this feeling very much.