Honda Rubicon spark plug problem

I purchased my 2013 Honda Rubicon 500 Feb. 2014 new. It was one of the left over 2013 models for the new year. When I first purchased it and the first oil change came up, its started missing, spitting and sputtering. I took it to the dealer ship and they said the spark plug had fouled. The would not cover it under warranty and the plug was $95. I thought they was trying to screw me but I looked up the plug and sure enough they are that high. Yesterday while working at my hunting lease. I went to pull out from a location and the atv just died. I tried starting it back up and it wouldn’t. Its like the plug had fouled again. I noticed a strong odor of gas so I looked at the carb, and there was gas coming from o hose that was on the top of the carb? When I normally park the atv, I turn the gas off. But this one time I turned the atv off for 10 minutes to do something, I did not turn the gas off. Any ideas? FYI this is the 3rd time this has happened to me, ive called Honda about this in the past. They don’t seem to interested on trying to figure out why this is happening. The last time I took it back to the dealer for this, they charged me 160 and said it was something I was doing. Any Ideas?