Ah, now I've found how to reproduce it all the time.
What I do is I grab the lid while its at about 90 degrees, then VERY slowly pull it down with the same force for like 1-3 degrees I estimate. If you do it slowly you can feel some resistance that it doesn't simply let you change the angle for a degree or so. I think it's the mechanism that allows the lid to keep its position, though you can at the same time wiggle it a bit, but it stays in the same position. If you pull it down very slowly though, so a bit further than a 'wiggle', then I can get it to click, not all the time.
I think it's normal now knowing this? As I'm somehow forcing the mechanism that keeps the lid in a certain angle by very slowly/minimally adjusting the screen angle. Anyone else can test and confirm or am I alone on this?