I think this is similar to that phenomenon where one gets though a hard level quite far, then dies, but has progressively less success after repeated tries, even in easier parts. I think we get tired of repeating segments of games, and get sloppy and do poorly. I also think we become stuck in a rut and see the same patterns/attack in the same manner over and over again - we tend not to innovate, and our play suffers. Breaks from playing refresh us and allow us to see things in a different light.
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