I'm right there with you man. I routinely go on 200 point swings where I will play beautiful games, then just throw my queen away for nothing (or some other major blunder). When I'm on a downswing, it will happen every single game, it seems. I'm not sure why I get into these swings, or how I get out, but I always do get out. It seems completely random as to when I will play well all the way through a game. I guess my advice would be to make sure you are getting plenty of sleep and eat well. I really think sleep might be my biggest issue. Longer time controls to think positions out may help as well. Good luck!
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