Didn't the story tell you?
I just got back from a 6 day golf trip with multiple money games going on and my new manzella swing that was lights out previously, showed up only the last 2 days. I couldn't get my takeaway right, I was fighting all kinds of shots the first 3 days, including a couple shanks. What is the story?
Sound like you are not really playing, but problem solving on mechanics, which is also a management problem in playing.
Manage what? Your mind, which takes care the right thing at the right time. Or "
think like a golfer, and execute like a robot".
Prior to execution, you do all the observing, comtonplating, analysizing, decision making, rehersing, mechanics maintaining...., laughing, cursing, joking, cheering,....everything and anything.
But, when it comes to execution, you switch to a robot mode, which knows, cares and does nothing, except executing the program you send to it. Of course, that takes a lot of practice.