When I play squash, I play well for about 2 games. After that I just seem to go downhill..Any tips?

For example, i played a game last week. I was winning comfortably 2-0 but then i just completely lost it..2-2 then I finished him off 9-3 to win 3-2. This keeps repeating whenever i play. I play well to begin with, then i cant seem to play! lol. any tips wud b gr8
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