I just bought this wave box and hooked it up...made two waves and quit...un hooked it took it apart checked it out...put it back together made four waves and quit again...so everytime it quits I pull it out of the water n check it out... Works for a while n then it quits...pump stops working...I have it in a 120 gal. Tank...what am I doing wrong...I adjust the wave frequency it still stops...12 v... Adjusted it up same thing...: (