I can tell you. They became arrogant and out of touch, wrong...

I can tell you. They became arrogant and out of touch, wrong people in wrong places with wrong ideas while others smugly took their eye of the ball listening to wrong people. The rule is: you can not go to the problem and say "You are the problem".
The previous paragraph can be kept for posterity because in most cases of big unexplainable loss cases those are the reasons. For example, has the tech suddenly become useless? The only other ingredient in a software company is the management and management's management of people and their outcomes/outputs..