I had same problem with mine.Had them at first race then next day knew something was wrong.They wouldn't fly any length of time and a few were sick and retainging food in their crops also some with spongy crops as they were full of water.I treated for 7 days with Harkers Adenoplus after which I sent dropping samples and crop swabs to De Weerdt which came back as slight Cocci and slight Canker which I treated for.The pigeons are looking 100% better but I feel its to late to try and train them for anymore races as we only have one race left.