When we get upset, and as a result, start skipping Dharma classes or doing Dharma work.
That is not how a 法器 Dharma Vessel is. A 法器 has no preferences, has no good day or bad day to transmit Dharma.
Whenever there are sentient beings ready to learn Dharma, the Dharma Vessel springs to action.
Whenever there are sentient beings suffering, the Dharma Vessel respond with compassion.