Why at the beginning of the 15th century, the French troops began to suffer defeat again?

In addition to direct military action, the position of the warring countries also depended on internal reasons. After all, in every country there were opposing parties that constantly fought for power. But the position of France was more difficult. Therefore, the defeat of the French must be explained as follows:

At the beginning of the 15th century, royal power was significantly weakened. The war was fought by aristocrats and their troops, in addition to the royal troops. Therefore, the contradictions inevitably reflected in the course of the entire war;
By this time, two rival groups had formed in France – the Burgundians and the Armagnacs. Each of them had their own claims to royalty. In fact, the country was on the brink of a full-scale civil war, which was disastrous in the face of hostilities with the British;
The participation of the people in the war was insufficient. Strife obscured the main thing from the aristocrats – the liberation of France from the British. After all, the war was fought in France. Nobody united and organized people against a common enemy.
The combination of these reasons led to a number of major defeats of the French.