I really cant say that it is the same thing, but I have had cats do that to me when they want attention. Could it be that he is feeling neglected for some reason and is trying to tell you? If he is a strictly outdoor cat and this started after winter set in when you didnt spend as much time outside, like in the hammock or just sitting maybe he is trying to say he misses you...
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Wheeeeeeeeeeeeeeeee Shorty