Also Ive noticed this affecting me in other aspects of my life, where I get to a certain point, then just quit. Its kinda like the kid that begs for a unicycle for a whole year, finally gets one on xmas, then a week later after he learns to ride it, it ends up in his closet, and is never used.
to me it sounds like you were trying to hard to improve your game and you starting taking poker too seriously. Sometimes you have to remember to take breaks from the game and remember to have fun as well as perform to your best abilities