Vice Admiral José Luis Urcelay Verdugo, head of the navy's plans division, said at the briefing that the main problems had been mechanical issues and also Skeldar's integration with the ships' systems
http://www.janes.com/article/33419/spanish-navy-continues-with-shipborne-uav-trials-despite-challenges-in-skeldar-tests
March 4, 2014: Back in 2013 the Spanish Navy leased (for six months) several Swedish Skeldar V-200 helicopter UAVs for some of its ships, including one headed for duty in the Indian Ocean as part of the anti-piracy patrol. The Spanish users reported that the Skeldar V had some serious problems. Mostly this involved mechanical unreliability when subjected to regular use at sea and difficulties getting the UAV electronics to reliably work with ship electronic systems. The Swedes are looking for ways to deal with the problems, but for the moment sales to the Spanish Navy are on hold.
https://www.strategypage.com/htmw/htnavai/articles/20140304.aspx