This has been an issue for a while now, gets quite annoying.

Basically the more intense the game is unit wise the worse this button acts. Clicking it causes it to blink constantly and from time to time not all units follow orders

It takes it couple of seconds to acknowledge the command and issue it to every unit (eg. hold position)

The other single-button style was better in the regard that when you clicked it, it issued the command straight away - this one is slow.