FC 25 gameplay

Why gameplay become heavy, players become like freeze, and their moves become heavy, speed of the ball become lower, mistakes in passes become often in such cases:

1. when I buld squad with players when their ratio higher than 92
2. first half can be with good gameplay, but second half gameplay become heavy, players become like freeze
3. After substitution (chemistry of my squad  33 before substitusion, and afer) gameplay become heavy, players become like freeze, and their moves become heavy
4. when I win first half, and opponent has not good skill, in second half  gameplay become heavy, players become like freeze