I can vouch for this.
Confidence and stamina plays a huge role.
I was playing a 3-day match for Parramatta, and my oppobents were batting. They were something like 4/225, and I'd taken all 4 wickets.
My captain bowled me to the ground - I ended up with figures of 7/97 off 45 overs (bearing in mind I'm an all-rounder!).
I took the last wicket to win us the game by 6 runs, but because I'd been overworked, my bowler had green confidence (taking wickets, bowling tight, getting the batsmen to play and miss), but no stamina - I could not get the ball to go faster than 128kph, and I could barely swing or seam the ball. My dude was rooted!
Accuracy and pace changes were still there, but it was a real struggle!