Does anyone else have a problem with their chickens tipping over their waterer? I have a regular one gallon plastic waterer in their coop and if I don't get their pop hole before they come down off their roosts in the morning I am pretty much guarateed to find the waterer tipped over on the floor. I have pine shavings over a vinyl floor so it's pretty easy to clean up, but I'd love to hear if anyone has found a way to prevent this.