(Newser) – It's been about a month since the sewage-plagued Carnival Triumph arrived in Alabama—and since then, three other Carnival ships have suffered problems. Yesterday saw news of human waste on the floor of the Dream; on Saturday, steering problems forced the Elation to resort to a tugboat; today, CNN reports that the Legend is having sailing-speed issues. The problem, related to the vessel's Azipod propulsion system, has prompted it to skip a Grand Cayman visit and head back to Florida.

The Azipod was also the system troubling the Elation, CNN notes. The Legend is still set to arrive on time, and its "safety systems and hotel services are all functioning normally," Carnival says. Still, passengers are seriously ticked off, one tells CNN via email. "Many have already said they will not book again with Carnival." It's not clear how many people are on the Legend, but it can hold some 2,100, NBC News notes. They're due to get a $100 refund. Meanwhile, flights begin today for passengers stuck on the Dream. (Read more Carnival Cruise Lines stories.)

