I'm having a problem getting one of my cats to stay in the house suddenly. He's been here almost a year and has been really good, but suddenly he's fixated on making the great excape. He's made it out twice and he burns so easily that he always come back with sunburned ears and usually with a battle scar or two from fighting with the other cats around. He is neutered, so that's not the problem. Anytime anyone comes in or out he'll charge them to try to get out, or if the screen door doesn't close tight he'll push it and squeeze how-How can I get him to stay inside where he's safe?