Recently having the same conniption. My forehand breaks down all of a sudden. An instructor started deconstructing what was going on. I started moving the contact zone too far back so that I was brushing too much without driving the ball. I'm no pro, but I would recommend making it as simple as possible to get back your groove. Namely, move your feet early, set up early, stay loose, keep your eye on the ball, and take a smooth cut through the ball, repeat. The less complicated you make it, the better off you'll be.
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