Why was ZhangJike expelled from the national team?

Why is ZhangJike sometimes expelled from the national team? There must be his reason, that is, he made a mistake.

Make the table tennis team unforgivable.

But the national team will also take care of his future survival.

Will it be published? What did he do wrong?

Just fired him, but

Generally speaking, the state will not expel excellent athletes for minor mistakes. Anyway, there are no minor mistakes in principle.

This is why he was expelled from the national team.