Bought a new 5 gallon waterer. Plastic vacuum type waterer with a screw cap at the bottom of the tank. About every other time I use it, it doesn't make a vacuum and all of the water runs out in about an hour. Bought it for the hen house, but once I had the great stinky flood and had to clean and dry the whole thing I moved it to the run. Am I doing something wrong or is this just a BS waterer? Bought it at TS. Would love to return it, but not sure they'd take it since I've been trying to use it for a couple of weeks.