Have you checked to see if his anal glands might need to be expressed? Sometimes mine will bite/lick their backsides when it is time for that. Have you noticed any scooting from him?
As for the front door, he might be hearing something as others have suggested. Could be the wind and the way it is blowing across the doorway. Sometimes mine will get all out of sorts at what I think is nothing-they go nuts and Hot Rod will make a really weird whiny-crying high pitched sound. Obviously something has his attention but I don't see anything at all.
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