Hi I had one and mine started to play up a bit after a while maybe the filter is full? It's the little tube like thing where you put the water in mine went all hard inside?x
i dont have one not really sure what this is lol.. (im only 12 weeks first time) at a guess maybe the water jug not connected right or some blocking the sencer. try pulling evey thing off it and put back together. good luck hope u can fix it xx