There is a rumor that Trump has not been attending his briefings lately. And that he prefers to get his own intelligence by calling foreign officials directly. This may be why.
He figured out that the intel agents were lying to him, and feeding him false information. That is why all the foreign officials in his mock trial in the House were so upset that he was going over their heads. They wanted to keep him in the dark and to feed him their agendas, and their bullshit version of the 'truth'. When he went over their heads by calling foreign officials directly, their web of lies was exposed.
That is why they were all so angry at him. They are used to calling the shots. And Trump would not put up with that.