I think that it has happened to everyone who has done a lot of surveys. It is not just a Fusion Cash problem.
I am on another site and last week, I finished more than one very long survey, submitted, and got a "sorry, not every survey can be a winner". This is after I had spent about 20 minutes on the survey and submitted.
Maybe this problem always existed but it seems to be happening more and more in the last couple of years.