I can relate - I recently had a run of mysterious fat wedge shots, and half wedge shots, and punch shots. I was sticking my clubface into the ground well before the ball - this meant shots that would make bystanders think I was an absolute beginner. These shots were terrible, and I would often hit two in a row with the same problem, failing to get onto the green from 100 yards in two. Essentially, I was crapping the bed, as an adult.
The problem was basically a lack of rhythm. Feet and weight transfer out of sync, and hands getting away from my body. Sometimes it is a sway back, or taking the club too inside. Or not unwinding the upper body into impact, leaving the chest and shoulders behind.
Yet mostly this was cured by focus/tempo/being the ball. No more complicated than that.