I am not an instructor. I honestly think missing the money ball is more of a mental error than any kind of physical cause. When I find myself doing this it's usually because I think "oh nice, I solved the rack, all I have to do is one last shot." Never congratulate yourself/let up early.
If I ever start thinking this, especially while shooting mode and not standing/analyzing mode, I will force myself to get up. Call an extension if on a shot clock, take a few slow deep breaths, maybe stretch my back or crouch to stretch my legs, or go take a sip of my drink.
Since I've learned to recognize myself doing this (step 1) and forced myself to stand up and get it together(step 2) then re-address the shot I've had it happen way less often. It does occasionally happen and when it does it's usually from being tired/lazy and not catching myself in the act of doing it.
Basically anytime I think I'm on easy street I have to stop myself because that's when mistakes happen. I've been up 4-0 in a 9B race to 5 and lost, simply by thinking "oh I got this all I have to do is play smart and let them make the mistakes."
I think in other sports they call it keeping your head in the game.
YMMV.