Ha Ha! Your strong holes to appear to be the ones that I loosen up on, and just don't play well. I usually do rally the last few holes, if something worth finishing strong for is on the line.
My entire adult life, whether I'm playing multiple rounds a week, or struggling to get in 3-4 rounds a year (current situation), I've been remarkable at finding ways to shoot 80. I've gone 4 under the last 4 holes to shoot 80 before. I've gone 8 over the last 4 holes to shoot 80 before. And pretty much every combination in between. The course, and tee boxes, usually don't matter either. I shot 81 at Cog Hill soon after the BMW a few years back, from similar tee boxes to what they played. The very next day I shot 80 at my little home course that I'd played probably 1000 rounds on.
Obviously a lot of it is mental. But for whatever reason, the more loose I get, the less solid I hit the ball.